add job menu and start job

ReallifeGamemode.Server/Extensions/ListExtensions.cs

@@ -0,0 +1,16 @@
+using GTANetworkAPI;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ReallifeGamemode.Server.Extensions
+{
+    static class ListExtensions
+    {
+        public static bool Contains(this List<Client> list, Client client)
+        {
+            return list.Any(l => l.Handle.Value == client.Handle.Value);
+        }
+    }
+}