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chore: add `CONTRIBUTING.md` (#198) #473

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Run time

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Job	Run time
test (18, ubuntu-latest)	35s
test (18, windows-latest)	1m 29s
test (20.4, ubuntu-latest)	38s
test (20.4, windows-latest)	1m 23s
test (20, ubuntu-latest)	31s
test (20, windows-latest)	1m 24s
test (lts/*, ubuntu-latest)	37s
test (lts/*, windows-latest)	1m 33s
	8m 10s