[Addition] Added a chatbox function!

Client/ViewModels/ViewModelGame.cs

@@ -1,16 +1,10 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.ComponentModel;
-using System.Text;
 
 namespace Client.ViewModels
 {
     class ViewModelGame : INotifyPropertyChanged
     {
         public event PropertyChangedEventHandler PropertyChanged;
-
-
-
-
     }
 }