[ADD] made join buttons disabled when starting a game

Client/Models/Model.cs

@@ -11,6 +11,7 @@ namespace Client
 
         private int _numbers;
         private bool _status;
+        private bool _canStartGame;
 
         //Test code 
         public int Numbers
@@ -37,11 +38,18 @@ namespace Client
             }
         }
 
+        public bool CanStartGame
+        {
+            get { return _canStartGame; }
+            set { _canStartGame = value; }
+        }
+
 
         public Model()
         {
             _status = false;
             _numbers = 0;
+            _canStartGame = true;
         }
 
     }

Client/ViewModels/ViewModel.cs

@@ -39,6 +39,7 @@ namespace Client
             {
                 if (SelectedLobby != null)
                 {
+                    _model.CanStartGame = false;
                     GameWindow window = new GameWindow();
                     window.Show();
                 }
@@ -55,7 +56,6 @@ namespace Client
         }
 
 
-
         private Model _model;
         public Model Model
         {