Fix README.md packaging path to support multiple locations

Author: jongalloway

src/NLWebNet/NLWebNet.csproj

@@ -63,7 +63,8 @@
 	<ItemGroup>
 		<FrameworkReference Include="Microsoft.AspNetCore.App" />
 	</ItemGroup>	<ItemGroup>
-		<None Include="$(MSBuildProjectDirectory)\..\..\README.md" Pack="true" PackagePath="\" />
+		<None Include="..\..\README.md" Pack="true" PackagePath="\" Condition="Exists('..\..\README.md')" />
+		<None Include="README.md" Pack="true" PackagePath="\" Condition="Exists('README.md') And !Exists('..\..\README.md')" />
 	</ItemGroup>
 
 </Project>