Tests

Add downloads badge to README #36

Job	Run time
lint	11s
Test (Python 3.12 on ubuntu-latest)	54s
Test (Python 3.12 on windows-latest)	1m 48s
Test (Python 3.11 on windows-latest)	1m 33s
Test (Python 3.11 on macos-latest)	50s
Test (Python 3.10 on windows-latest)	1m 48s
Test (Python 3.11 on ubuntu-latest)	48s
Test (Python 3.10 on ubuntu-latest)	49s
Test (Python 3.10 on macos-latest)	1m 20s
Test (Python 3.12 on macos-latest)	38s
	10m 39s

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