Add a workflow for welcoming first-time contributors #61

Job	Run time
Soundness / Documentation check	40s
Soundness / Broken symlinks check	5s
Soundness / License headers check	5s
Soundness / API breakage check	0s
Soundness / Format check	0s
Soundness / Unacceptable language check	4s
Soundness / Python lint check	5s
Soundness / Shell check	30s
Soundness / YAML lint check	4s
	1m 33s

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