first commit

Yapper/MVVM/ViewModel/MainViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using YapperClient.MVVM.Core;
+using YapperClient.MVVM.Model;
+using YapperClient.Net;
+
+namespace YapperClient.MVVM.ViewModel
+{
+    class MainViewModel
+    {
+        public ObservableCollection<UserModel> Users { get; set; }
+        public RelayCommand ConnectToServerCommand { get; set; }
+
+        public string UserName { get; set; }
+
+        private Server _server;
+        public MainViewModel() {
+            Users = new ObservableCollection<UserModel>();
+            _server = new Server();
+            _server.connectedEvent += UserConnected;
+            ConnectToServerCommand = new RelayCommand(o => _server.ConnectToServer(UserName), o => !string.IsNullOrEmpty(UserName));
+        }
+
+        private void UserConnected()
+        {
+            var user = new UserModel
+            {
+                UserName = _server.PacketReader.ReadMessage(),
+                UID = _server.PacketReader.ReadMessage(),
+            };
+
+            if (!Users.Any(x => x.UID == user.UID))
+            {
+                Application.Current.Dispatcher.Invoke(() => Users.Add(user));
+            }
+        }
+    }
+}