🔧 Adds handling for samples & tests

samples/Directory.Build.props

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+../.config/Extras.Directory.Build.props

src/Directory.build.props

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+<Project>
+  <ImportGroup Condition="Exists($([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))) == 'true'">
+    <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
+  </ImportGroup>
+
+  <PropertyGroup Label="Package">
+    <PackageProjectUrl>http://localhost</PackageProjectUrl>
+    <RepositoryUrl>http://localhost</RepositoryUrl>
+  </PropertyGroup>
+</Project>

tests/Directory.Build.props

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+../.config/Tests.Directory.Build.props