Well it's in three files here 
group_commands[server]  
-- Create a Gang 
  
function addGroup (thePlayer,cmd,groupByName) 
     local player = isPedInVehicle(thePlayer) 
            if player then 
              outputChatBox("Can't make a group inside a vehicle!",client,255,255,0) 
            elseif groupByName then 
              local qh = dbQuery( connection, "INSERT INTO table_name VALUES (?)", "'" .. tostring(gangName) .. "'" ) 
              dbPoll (qh,0) 
              outputChatBox("Group System : You successfully created group : " "".. tostring(groupByName) .."" ,client,255,255,0) 
              setElementData(root,"groupName", ..tostring(groupByName).. ) 
            else 
               outputChatBox("Invalid syntax. Syntax is /creategroup ",255,255,0) 
            end 
end      
         
 
groups.lua [server] 
connect = dbConnect("sqlite","groups.db") 
if connect then  
outputDebugString("connectionn Success") 
end 
  
 
c_groups.lua [client] 
-- The main gui and the client core of the resource 
  
local groupName = getElementData(localPlayer,"groupName") 
  
tab = {} 
scrollpane = {} 
combo = {} 
scroll = {} 
window = {} 
grid = {} 
button = {} 
edit = {} 
label = {} 
memo = {} 
addEventHandler("onClientResourceStart", resourceRoot, 
    function() 
        window.Group = guiCreateWindow(0.25, 0.15, 0.50, 0.65, "Group System", true) 
        guiWindowSetMovable(window.Group, false) 
        guiWindowSetSizable(window.Group, false) 
  
        tabPanel = guiCreateTabPanel(0.05, 0.22, 0.91, 0.74, true, window.Group) 
  
        tab.Tab = guiCreateTab("Group Info", tabPanel) 
  
        label.groupName = guiCreateLabel(0.05, 0.04, 0.88, 0.18,"" .. tostring(groupName) .. "", true, tab.Tab) 
        guiSetFont(label.groupName, "sa-header") 
        guiLabelSetHorizontalAlign(label.groupName, "center", false) 
        guiLabelSetVerticalAlign(label.groupName, "center") 
        label.MembersInfo = guiCreateLabel(0.07, 0.28, 0.42, 0.13, "Members : ", true, tab.Tab) 
        guiSetFont(label.MembersInfo, "clear-normal") 
        guiLabelSetHorizontalAlign(label.MembersInfo, "center", false) 
        guiLabelSetVerticalAlign(label.MembersInfo, "center") 
        label.MoneyInfo = guiCreateLabel(0.51, 0.29, 0.37, 0.12, "Money : ", true, tab.Tab) 
        guiSetFont(label.MoneyInfo, "clear-normal") 
        guiLabelSetHorizontalAlign(label.MoneyInfo, "center", false) 
        guiLabelSetVerticalAlign(label.MoneyInfo, "center") 
        label.BaseInfo = guiCreateLabel(0.08, 0.82, 0.83, 0.13, "Base : ", true, tab.Tab) 
        guiSetFont(label.BaseInfo, "clear-normal") 
        guiLabelSetHorizontalAlign(label.BaseInfo, "center", false) 
        guiLabelSetVerticalAlign(label.BaseInfo, "center") 
        button.setMotdInfo = guiCreateButton(0.34, 0.72, 0.30, 0.07, "Set MOTD", true, tab.Tab) 
        guiSetProperty(button.setMotdInfo, "NormalTextColour", "FFAAAAAA") 
        label.MotdInfo = guiCreateLabel(0.19, 0.45, 0.57, 0.04, "Message of the Day (MOTD)", true, tab.Tab) 
        guiLabelSetHorizontalAlign(label.MotdInfo, "center", false) 
        guiLabelSetVerticalAlign(label.MotdInfo, "center") 
        memo.motd = guiCreateMemo(0.13, 0.53, 0.70, 0.16, "", true, tab.Tab) 
  
        tab.Members = guiCreateTab("Members", tabPanel) 
  
        scrollpane.getOnlinePlayers = guiCreateScrollPane(0.56, 0.02, 0.41, 0.80, true, tab.Members) 
  
        grid.onlinePlayers = guiCreateGridList(0.00, 0.00, 1.00, 1.00, true, scrollpane.getOnlinePlayers) 
        guiGridListAddColumn(grid.onlinePlayers, "Name", 0.9) 
  
        scroll.onlinePlayers = guiCreateScrollBar(0.88, 0.12, 0.06, 0.83, false, true, grid.onlinePlayers) 
  
  
        button.Invite = guiCreateButton(0.59, 0.87, 0.34, 0.08, "Invite Player", true, tab.Members) 
        guiSetProperty(button.Invite, "NormalTextColour", "FFAAAAAA") 
        scrollpane.members = guiCreateScrollPane(11, 7, 303, 276, false, tab.Members) 
  
        grid.membersGroup = guiCreateGridList(0.00, 0.00, 1.00, 1.00, true, scrollpane.members) 
        guiGridListAddColumn(grid.membersGroup, "Name", 0.5) 
        guiGridListAddColumn(grid.membersGroup, "Rank", 0.5) 
  
        scroll.mem = guiCreateScrollBar(0.88, 0.10, 0.07, 0.82, false, true, grid.membersGroup) 
  
  
        label.setRank = guiCreateLabel(0.03, 0.88, 0.18, 0.06, "Set Member Rank : ", true, tab.Members) 
        combo.setRank = guiCreateComboBox(0.23, 0.87, 0.11, 0.09, "", true, tab.Members) 
        guiComboBoxAddItem(combo.setRank, "1") 
        guiComboBoxAddItem(combo.setRank, "2") 
        guiComboBoxAddItem(combo.setRank, "3") 
        guiComboBoxAddItem(combo.setRank, "4") 
        guiComboBoxAddItem(combo.setRank, "5") 
  
        tab.rules = guiCreateTab("Rules", tabPanel) 
  
        memo.rules = guiCreateMemo(0.02, 0.02, 0.96, 0.86, "", true, tab.rules) 
        button.editRules = guiCreateButton(0.36, 0.89, 0.28, 0.08, "Edit Rules", true, tab.rules) 
        guiSetProperty(button.editRules, "NormalTextColour", "FFAAAAAA") 
  
        tab.settings = guiCreateTab("Settings", tabPanel) 
  
        label.warn = guiCreateLabel(0.08, 0.04, 0.87, 0.05, "Note : Only the set group skin is available for group members the rest settings are for leader only!", true, tab.settings) 
        guiLabelSetHorizontalAlign(label.warn, "center", false) 
        guiLabelSetVerticalAlign(label.warn, "center") 
        button.setskin = guiCreateButton(0.35, 0.14, 0.30, 0.10, "Set Group Skin", true, tab.settings) 
        guiSetProperty(button.setskin, "NormalTextColour", "FFAAAAAA") 
        label.playerMotdRank = guiCreateLabel(0.09, 0.32, 0.32, 0.06, "Player rank required to edit MOTD :", true, tab.settings) 
        combo.setMotd = guiCreateComboBox(0.41, 0.30, 0.09, 0.07, "", true, tab.settings) 
        guiComboBoxAddItem(combo.setMotd, "1") 
        guiComboBoxAddItem(combo.setMotd, "2") 
        guiComboBoxAddItem(combo.setMotd, "3") 
        guiComboBoxAddItem(combo.setMotd, "4") 
        guiComboBoxAddItem(combo.setMotd, "5") 
        label.setPlayerAddMoneyRank = guiCreateLabel(0.09, 0.40, 0.40, 0.04, "Player rank required to add money in group :", true, tab.settings) 
        combo.AddMoneyRank = guiCreateComboBox(0.49, 0.40, 0.09, 0.06, "", true, tab.settings) 
        guiComboBoxAddItem(combo.AddMoneyRank, "1") 
        guiComboBoxAddItem(combo.AddMoneyRank, "2") 
        guiComboBoxAddItem(combo.AddMoneyRank, "3") 
        guiComboBoxAddItem(combo.AddMoneyRank, "4") 
        guiComboBoxAddItem(combo.AddMoneyRank, "5") 
        label.takeMoney = guiCreateLabel(0.09, 0.51, 0.47, 0.04, "Player rank required to withdraw money from group : ", true, tab.settings) 
        combo.takeMoney = guiCreateComboBox(0.57, 0.50, 0.09, 0.07, "", true, tab.settings) 
        guiComboBoxAddItem(combo.takeMoney, "1") 
        guiComboBoxAddItem(combo.takeMoney, "2") 
        guiComboBoxAddItem(combo.takeMoney, "3") 
        guiComboBoxAddItem(combo.takeMoney, "4") 
        guiComboBoxAddItem(combo.takeMoney, "5") 
        button.leaveGroup = guiCreateButton(0.37, 0.67, 0.29, 0.12, "Leave Group", true, tab.settings) 
        guiSetProperty(button.leaveGroup, "NormalTextColour", "FFAAAAAA") 
        button.deleteGroup = guiCreateButton(0.37, 0.84, 0.29, 0.12, "Delete Group", true, tab.settings) 
        guiSetProperty(button.deleteGroup, "NormalTextColour", "FFAAAAAA") 
  
        tab.money = guiCreateTab("Money", tabPanel) 
  
        label.groupMoney = guiCreateLabel(0.31, 0.02, 0.34, 0.10, "Group Money", true, tab.money) 
        guiLabelSetHorizontalAlign(label.groupMoney, "center", false) 
        guiLabelSetVerticalAlign(label.groupMoney, "center") 
        label.showMoney = guiCreateLabel(131, 49, 340, 109, "", false, tab.money) 
        edit.addMoney = guiCreateEdit(0.06, 0.76, 0.28, 0.09, "", true, tab.money) 
        button.addMoney = guiCreateButton(0.06, 0.89, 0.28, 0.07, "Add Money", true, tab.money) 
        guiSetProperty(button.addMoney, "NormalTextColour", "FFAAAAAA") 
        edit.takeMoney = guiCreateEdit(0.68, 0.76, 0.28, 0.10, "", true, tab.money) 
        button.takeMoney = guiCreateButton(0.68, 0.88, 0.28, 0.07, "Withdraw Money", true, tab.money) 
        guiSetProperty(button.takeMoney, "NormalTextColour", "FFAAAAAA") 
  
  
        label.MainName = guiCreateLabel(0.05, 0.06, 0.91, 0.15,"" .. tostring(groupName) .."" , true, window.Group) 
        guiSetFont(label.MainName, "sa-header") 
        guiLabelSetHorizontalAlign(label.MainName, "center", false) 
        guiLabelSetVerticalAlign(label.MainName, "center")     
    end 
) 
  
addEventHandler("onCLientResourceStart",resourceRoot, 
           function () 
              triggerServerEvent("createGroup",source) 
               
            end 
  
) 
         
  
-- This will spawn when someone decides to leave thwe group! 
  
button = {} 
window = {} 
label = {} 
addEventHandler("onClientResourceStart", resourceRoot, 
    function() 
        window.leaveGroup = guiCreateWindow(0.30, 0.21, 0.40, 0.48, "", true) 
        guiWindowSetMovable(window.leaveGroup, false) 
        guiWindowSetSizable(window.leaveGroup, false) 
        guiSetAlpha(window.leaveGroup, 0.82) 
  
        label.leaveGroup = guiCreateLabel(0.04, 0.10, 0.92, 0.10, "Are you sure you want to leave the group?", true, window.leaveGroup) 
        guiLabelSetHorizontalAlign(label.leaveGroup, "center", false) 
        button.leaveGroup = guiCreateButton(0.26, 0.33, 0.50, 0.19, "Yes", true, window.leaveGroup) 
        guiSetProperty(button.leaveGroup, "NormalTextColour", "FFAAAAAA") 
        button.stay = guiCreateButton(0.26, 0.63, 0.50, 0.16, "No", true, window.leaveGroup) 
        guiSetProperty(button.stay, "NormalTextColour", "FFAAAAAA")     
    end 
) 
  
  
-- THis will give warning when deleting group 
  
  
button = {} 
window = {} 
label = {} 
addEventHandler("onClientResourceStart", resourceRoot, 
    function() 
        window.deleteGroup = guiCreateWindow(0.33, 0.28, 0.36, 0.39, "", true) 
        guiWindowSetMovable(window.deleteGroup, false) 
        guiWindowSetSizable(window.deleteGroup, false) 
  
        label.deleteGroup = guiCreateLabel(0.02, 0.09, 0.96, 0.14, "Are you sure you want to delete the group!!!", true, window.deleteGroup) 
        guiLabelSetHorizontalAlign(label.deleteGroup, "center", false) 
        guiLabelSetVerticalAlign(label.deleteGroup, "center") 
        button.deleteGroup = guiCreateButton(0.29, 0.36, 0.42, 0.17, "Yes", true, window.deleteGroup) 
        guiSetProperty(button.deleteGroup, "NormalTextColour", "FFAAAAAA") 
        button.donotDelete = guiCreateButton(0.30, 0.63, 0.41, 0.18, "No", true, window.deleteGroup) 
        guiSetProperty(button.donotDelete, "NormalTextColour", "FFAAAAAA")     
    end 
) 
  
  
 
I have just started with the resource.