chore: make README.md and GitHub repository recognizable to NuGet registry

Author: teneko

Directory.Build.props

@@ -7,6 +7,8 @@
     <PackageLicenseFile Condition="'$(PackageLicenseFile)' == ''">LICENSE</PackageLicenseFile>
     <PackageIcon Condition="'$(PackageIcon)' == ''">icon.jpg</PackageIcon>
     <LangVersion Condition="'$(LangVersion)' == ''">9.0</LangVersion>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
   </PropertyGroup>
 
   <ItemGroup>