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Add contributing section and update README help messages #180

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Run time

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Job	Run time
tests (ubuntu-latest \| Python 3.10)	3m 55s
tests (windows-latest \| Python 3.10)	13m 48s
tests (macos-14 \| Python 3.10)	4m 31s
tests (ubuntu-latest \| Python 3.12)	4m 46s
tests (windows-latest \| Python 3.12)	11m 36s
tests (macos-14 \| Python 3.12)	6m 0s
	44m 36s