First commit

AMessanger/ViewModels/MainViewModel.cs

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+using System.Collections.ObjectModel;
+using AMessanger.Services;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Avalonia.Threading;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+using System.Diagnostics;
+
+namespace AMessanger.ViewModels;
+
+public partial class MainViewModel : ViewModelBase
+{
+    [ObservableProperty]
+    public partial ObservableCollection<string> Messages { get; private set; } = new();
+
+    [ObservableProperty]
+    public partial string Message { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial string UserName { get; set; } = "Test user";
+
+    public ICommand SendButtonCommand { get; private set; }
+
+    private readonly ChatService _chat;
+
+    public MainViewModel(ChatService chatService)
+    {
+        _chat = chatService;
+        _chat.OnMessageRecieved += OnMessageRecived;
+
+        SendButtonCommand = new RelayCommand(SendMessage);
+    }
+
+    private void OnMessageRecived(string user, string message)
+    {
+        Dispatcher.UIThread.Post(() => Messages.Add($"{user}: {message}"));
+        Debug.WriteLine($"{user}: {message}");
+    }
+
+    private void SendMessage()
+    {
+        if (string.IsNullOrWhiteSpace(Message))
+            return;
+
+        _chat.SendMessageAsync(UserName, Message.Trim());
+        Message = string.Empty;
+    }
+}

AMessanger/ViewModels/ViewModelBase.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace AMessanger.ViewModels;
+
+public abstract class ViewModelBase : ObservableObject
+{
+}