Env instructions #229

Job	Run time
Build and test (3.9, ubuntu-latest)	1m 50s
Build and test (3.9, macos-latest)	2m 51s
Build and test (3.9, windows-latest)	4m 44s
Build and test (3.10, ubuntu-latest)	1m 46s
Build and test (3.10, macos-latest)	3m 11s
Build and test (3.10, windows-latest)	4m 26s
Build and test (3.11, ubuntu-latest)	1m 53s
Build and test (3.11, macos-latest)	3m 54s
Build and test (3.11, windows-latest)	4m 37s
Build and test (3.12, ubuntu-latest)	1m 48s
Build and test (3.12, macos-latest)	3m 13s
Build and test (3.12, windows-latest)	3m 51s
	38m 4s

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