Fixed pack

Author: gigi81

src/System.IO.Abstractions.Extensions/System.IO.Abstractions.Extensions.csproj

@@ -7,8 +7,13 @@
 		<RootNamespace>System.IO.Abstractions</RootNamespace>
 		<PackageReleaseNotes>$([System.IO.File]::ReadAllText("$(MSBuildProjectDirectory)/../../ReleaseNotes.md"))</PackageReleaseNotes>
 		<LangVersion>9.0</LangVersion>
+		<PackageReadmeFile>README.md</PackageReadmeFile>
 	</PropertyGroup>
 
+	<ItemGroup>
+		<None Include="$(MSBuildThisFileDirectory)../../README.md" Pack="true" PackagePath="\"/>
+	</ItemGroup>
+
 	<ItemGroup>
 	  <!-- Dependencies of TestableIO.System.IO.Abstractions changed in 22.0 -->
 	  <PackageReference Include="TestableIO.System.IO.Abstractions" Version="[22.*,)" />