Added a minimal GUI based on Avalonia UI library for C#

DiscordBotGUI/DiscordBotGUI.csproj

@@ -0,0 +1,34 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <!--Avalonia doesen't support TrimMode=link currently,but we are working on that https://github.com/AvaloniaUI/Avalonia/issues/6892 -->
+    <TrimMode>copyused</TrimMode>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <BaseOutputPath>..\BUILDS\DiscordBotUI\</BaseOutputPath>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <Optimize>False</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove=".gitignore" />
+  </ItemGroup>
+  <ItemGroup>
+    <!--This helps with theme dll-s trimming.
+	If you will publish your application in self-contained mode with p:PublishTrimmed=true and it will use Fluent theme Default theme will be trimmed from the output and vice versa.
+	https://github.com/AvaloniaUI/Avalonia/issues/5593 -->
+    <TrimmableAssembly Include="Avalonia.Themes.Fluent" />
+    <TrimmableAssembly Include="Avalonia.Themes.Default" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="0.10.14" />
+    <PackageReference Include="Avalonia.Desktop" Version="0.10.14" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="0.10.14" />
+    <PackageReference Include="XamlNameReferenceGenerator" Version="1.3.4" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\PluginManager\PluginManager.csproj" />
+  </ItemGroup>
+</Project>