Support for package icon file (#800)

Author: WeihanLi

Diff for: logo.png

@@ -8,6 +8,7 @@
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/kubernetes-client/csharp</PackageProjectUrl>
     <PackageIconUrl>https://raw.githubusercontent.com/kubernetes/kubernetes/master/logo/logo.png</PackageIconUrl>
+    <PackageIcon>logo.png</PackageIcon>
     <PackageTags>kubernetes;docker;containers;</PackageTags>
 
     <TargetFrameworks>netstandard2.1;net5;net6</TargetFrameworks>
@@ -32,6 +33,7 @@
 
   <ItemGroup>
    <AdditionalFiles Include="swagger.json" />
+   <None Include="../../logo.png" Pack="true" Visible="false" PackagePath="" />
    <ProjectReference Include="..\LibKubernetesGenerator\LibKubernetesGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
   </ItemGroup>