Add usage instructions to `README` (#69) #160

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Run time

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Job	Run time
test (ubuntu-latest, stable)	53s
test (ubuntu-latest, nightly)	41s
test (macos-latest, stable)	1m 6s
test (macos-latest, nightly)	51s
test (windows-latest, stable)	1m 30s
test (windows-latest, nightly)	1m 8s
	6m 9s