Add icon for Jellyfin Windows build (#10997)

Add icon to make it easier for Windows users to recognize.

This requires dotnet 8 or newer.

Signed-off-by: nyanmisaka <nst799610810@gmail.com>

Jellyfin.Server/Jellyfin.Server.csproj

@@ -12,12 +12,17 @@
     <ServerGarbageCollection>false</ServerGarbageCollection>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <ApplicationIcon>Jellyfin.Server.ico</ApplicationIcon>
   </PropertyGroup>
 
   <ItemGroup>
     <Compile Include="..\SharedVersion.cs" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Content Include="Jellyfin.Server.ico" />
+  </ItemGroup>
+
   <ItemGroup>
     <EmbeddedResource Include="Resources/Configuration/*" />
   </ItemGroup>