Create dotnet-desktop.yml

[prechayimmee]

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[alerickson]

@prechayimmee Is there something in particular you wanted to see with this PR? There's no description in the PR so just curious why exactly you wanted to add the dotnet-desktop yaml?

[alerickson]

@prechayimmee Going to close this PR for now since the contributor license has not been signed after 3 weeks as well. Feel free to comment here or open an issue to discuss this PR. Thank you!