(temp) Add needed properties to enable sourcelink

Source/Directory.Build.props

@@ -0,0 +1,11 @@
+<Project>
+  <PropertyGroup>
+    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All"/>
+  </ItemGroup>
+</Project>

Source/Directory.Build.targets

@@ -0,0 +1,23 @@
+<!-- This target must be imported into Directory.Build.targets -->
+<!-- Workaround. Remove once we're on 3.1.300+
+https://github.com/dotnet/sourcelink/issues/572 -->
+<Project>
+  <PropertyGroup>
+    <TargetFrameworkMonikerAssemblyAttributesPath>$([System.IO.Path]::Combine('$(IntermediateOutputPath)','$(TargetFrameworkMoniker).AssemblyAttributes$(DefaultLanguageSourceExtension)'))</TargetFrameworkMonikerAssemblyAttributesPath>
+  </PropertyGroup>
+  <ItemGroup>
+    <EmbeddedFiles Include="$(GeneratedAssemblyInfoFile)"/>
+  </ItemGroup>
+  <ItemGroup>
+    <SourceRoot Include="$(NuGetPackageRoot)" />
+  </ItemGroup>
+
+  <Target Name="CoverletGetPathMap"
+        DependsOnTargets="InitializeSourceRootMappedPaths"
+        Returns="@(_LocalTopLevelSourceRoot)"
+        Condition="'$(DeterministicSourcePaths)' == 'true'">
+    <ItemGroup>
+    <_LocalTopLevelSourceRoot Include="@(SourceRoot)" Condition="'%(SourceRoot.NestedRoot)' == ''"/>
+    </ItemGroup>
+  </Target>
+</Project>