Added Avanlonia frontend.

FrontendAvalonia/FrontendAvalonia.Desktop/.avalonia-build-tasks/id

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+<EFBFBD>
<01>g/<2F>L<><4C><EFBFBD>Ѓ^/<2F>

FrontendAvalonia/FrontendAvalonia.Desktop/FrontendAvalonia.Desktop.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <!--If you are willing to use Windows/MacOS native APIs you will need to create 3 projects.
+    One for Windows with net7.0-windows TFM, one for MacOS with net7.0-macos and one with net7.0 TFM for Linux.-->
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.3" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FrontendAvalonia\FrontendAvalonia.csproj" />
+  </ItemGroup>
+</Project>

FrontendAvalonia/FrontendAvalonia.Desktop/Program.cs

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+using System;
+using Avalonia;
+using Avalonia.ReactiveUI;
+
+namespace FrontendAvalonia.Desktop;
+
+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()
+            .WithInterFont()
+            .LogToTrace()
+            .UseReactiveUI();
+}

FrontendAvalonia/FrontendAvalonia.Desktop/Properties/launchSettings.json

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+{
+  "profiles": {
+    "FrontendAvalonia.Desktop": {
+      "commandName": "Project"
+    },
+    "WSL": {
+      "commandName": "WSL2",
+      "distributionName": ""
+    }
+  }
+}

FrontendAvalonia/FrontendAvalonia.Desktop/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="FrontendAvalonia.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>