Merge pull request #627 from UnknownSuperficialNight/add-contributing… #473

Job	Run time
cargo-publish	21s
create-git-tag	7s
Tests (macos-latest, stable)	1m 1s
Tests (macos-latest, beta)	57s
Tests (macos-latest, nightly)	1m 2s
Tests (windows-latest, stable)	1m 42s
Tests (windows-latest, beta)	1m 40s
Tests (windows-latest, nightly)	1m 33s
Tests (ubuntu-latest, stable)	57s
Tests (ubuntu-latest, beta)	59s
Tests (ubuntu-latest, nightly)	51s
	11m 10s

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