chore: import upstream snapshot with attribution

dotnet/Directory.Build.targets

@@ -0,0 +1,12 @@
+<Project>
+  <!-- Direct all packages under 'dotnet' to get versions from Directory.Packages.props -->
+  <!-- using Central Package Management feature -->
+  <!-- https://learn.microsoft.com/en-us/nuget/consume-packages/Central-Package-Management -->
+  <Sdk Name="Microsoft.Build.CentralPackageVersions" Version="2.1.3" />
+  <!-- Only run 'dotnet format' on dev machines, Release builds. Skip on GitHub Actions and Azure DevOps. -->
+  <Target Name="DotnetFormatOnBuild" BeforeTargets="Build"
+          Condition=" '$(Configuration)' == 'Release' AND '$(GITHUB_ACTIONS)' == '' AND '$(TF_BUILD)' != 'true' ">
+    <Message Text="Running dotnet format" Importance="high" />
+    <Exec Command="dotnet format --no-restore -v diag $(ProjectFileName)" />
+  </Target>
+</Project>