Port chat samples to AvaloniaUI.

Samples/Chat.Core/ChatClient/.gitignore

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+
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+.mfractor/
+
+FodyWeavers.xsd

Samples/Chat.Core/ChatClient/App.xaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:ChatClient"
+             x:Class="ChatClient.App">
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+
+    <Application.Styles>
+        <StyleInclude Source="avares://Avalonia.Themes.Default/DefaultTheme.xaml"/>
+        <StyleInclude Source="avares://Avalonia.Themes.Default/Accents/BaseLight.xaml"/>
+    </Application.Styles>
+</Application>

Samples/Chat.Core/ChatClient/App.xaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using ChatClient.ViewModels;
+using ChatClient.Views;
+
+namespace ChatClient
+{
+    public class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            {
+                var viewModel = new MainWindowViewModel();
+                desktop.MainWindow = new MainWindow
+                {
+                    DataContext = viewModel,
+                };
+
+                viewModel.Initialized();
+                desktop.Exit += (sender, args) =>
+                {
+                    viewModel.Exiting();
+                };
+                desktop.ShutdownMode = ShutdownMode.OnMainWindowClose;
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+    }
+}