add license url

Author: enricosada

src/Directory.Build.props

@@ -5,6 +5,7 @@
     <PackageProjectUrl>https://github.com/enricosada/dotnet-proj-info/</PackageProjectUrl>
     <PackageTags>mbuild;dotnet;sdk;csproj;fsproj</PackageTags>
     <RepositoryUrl>https://github.com/enricosada/dotnet-proj-info.git</RepositoryUrl>
+    <PackageLicenseUrl>https://github.com/enricosada/dotnet-proj-info/blob/master/LICENSE</PackageLicenseUrl>
 
     <RepoRootDir>$([System.IO.Path]::GetFullPath("$(MSBuildThisFileDirectory)\.."))</RepoRootDir>
     <NupkgsDir>$(RepoRootDir)/bin/nupkg</NupkgsDir>