feat: initialize projects.

demo/Ursa.Demo/App.axaml

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+<Application
+    x:Class="Ursa.Demo.App"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Ursa.Demo">
+    <Application.Styles>
+        <StyleInclude Source="avares://Semi.Avalonia/Themes/LightTheme.axaml" />
+    </Application.Styles>
+</Application>

demo/Ursa.Demo/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using Avalonia.Markup.Xaml;
+using Ursa.Demo.ViewModels;
+using Ursa.Demo.Views;
+
+namespace Ursa.Demo;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            // Line below is needed to remove Avalonia data validation.
+            // Without this line you will get duplicate validations from both Avalonia and CT
+            ExpressionObserver.DataValidators.RemoveAll(x => x is DataAnnotationsValidationPlugin);
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainWindowViewModel(),
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

demo/Ursa.Demo/Program.cs

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+using Avalonia;
+using System;
+
+namespace Ursa.Demo;
+
+class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .LogToTrace();
+}

demo/Ursa.Demo/Roots.xml

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+<linker>
+  <!-- Can be removed if CompiledBinding and no reflection are used -->
+  <assembly fullname="Ursa.Demo" preserve="All" />
+  <assembly fullname="Avalonia.Themes.Fluent" preserve="All" />
+</linker>

demo/Ursa.Demo/Ursa.Demo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+        <ApplicationManifest>app.manifest</ApplicationManifest>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Folder Include="Models\" />
+        <AvaloniaResource Include="Assets\**" />
+        <None Remove=".gitignore" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <TrimmerRootDescriptor Include="Roots.xml" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Avalonia" Version="11.0.0-preview4" />
+        <PackageReference Include="Avalonia.Desktop" Version="11.0.0-preview4" />
+        <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.0-preview4" />
+        <PackageReference Include="CommunityToolkit.Mvvm" Version="8.1.0" />
+        <PackageReference Include="Semi.Avalonia" Version="0.1.0-preview3" />
+        <PackageReference Include="XamlNameReferenceGenerator" Version="1.5.1" />
+    </ItemGroup>
+</Project>

demo/Ursa.Demo/ViewLocator.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using Ursa.Demo.ViewModels;
+
+namespace Ursa.Demo;
+
+public class ViewLocator : IDataTemplate
+{
+    public IControl Build(object data)
+    {
+        var name = data.GetType().FullName!.Replace("ViewModel", "View");
+        var type = Type.GetType(name);
+
+        if (type != null)
+        {
+            return (Control)Activator.CreateInstance(type)!;
+        }
+
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    public bool Match(object data)
+    {
+        return data is ViewModelBase;
+    }
+}

demo/Ursa.Demo/ViewModels/MainWindowViewModel.cs

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+namespace Ursa.Demo.ViewModels;
+
+public class MainWindowViewModel : ViewModelBase
+{
+    public string Greeting => "Welcome to Avalonia!";
+}

demo/Ursa.Demo/ViewModels/ViewModelBase.cs

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

demo/Ursa.Demo/Views/MainWindow.axaml

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+<Window
+    x:Class="Ursa.Demo.Views.MainWindow"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:vm="using:Ursa.Demo.ViewModels"
+    Title="Ursa.Demo"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    Icon="/Assets/avalonia-logo.ico"
+    mc:Ignorable="d">
+
+    <Design.DataContext>
+        <vm:MainWindowViewModel />
+    </Design.DataContext>
+
+    <StackPanel Spacing="20">
+        <TextBlock
+            HorizontalAlignment="Center"
+            VerticalAlignment="Center"
+            Text="{Binding Greeting}" />
+        <Button Content="Hello World" />
+    </StackPanel>
+
+</Window>

demo/Ursa.Demo/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace Ursa.Demo.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}

demo/Ursa.Demo/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embeded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="AvaloniaTest.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>