[qb-mdt] - New DB Callback

- Add callback to DB to match citizenids to player license

server/dbm.lua

@@ -1,5 +1,16 @@
 local QBCore = exports['qb-core']:GetCoreObject()
 
+-- Get CitizenIDs from Player License
+function GetCitizenID(license)
+    local result = MySQL.query.await("SELECT citizenid FROM players WHERE license = ?", {license,})
+    if result ~= nil then
+        return result
+    else
+        print("Cannot find a CitizenID for License: "..license)
+        return nil
+    end
+end
+
 -- (Start) Opening the MDT and sending data
 function AddLog(text)
 	--print(text)
@@ -155,4 +166,4 @@ function ManageLicenses(identifier, incomingLicenses)
         end
         MySQL.query.await('UPDATE `players` SET `metadata` = @metadata WHERE citizenid = @citizenid', {['@metadata'] = json.encode(result), ['@citizenid'] = identifier})
     end
-end
+end