Add basic CI workflow and README #7

Job	Run time
Check code is formatted (Black)	5s
pytest (linux/3.9/dev)	1m 20s
pytest (win64/3.9/dev)	5m 12s
pytest (linux/3.10/dev)	1m 18s
pytest (win64/3.10/dev)	5m 32s
pytest (linux/3.11/dev)	1m 25s
pytest (win64/3.11/dev)	6m 0s
pytest (linux/3.12/dev)	1m 26s
pytest (win64/3.12/dev)	5m 13s
pytest (linux/3.9/standard)	42s
pytest (win64/3.9/standard)	2m 44s
pytest (linux/3.10/standard)	1m 16s
pytest (win64/3.10/standard)	1m 38s
pytest (linux/3.11/standard)	39s
pytest (win64/3.11/standard)	1m 45s
pytest (linux/3.12/standard)	50s
pytest (win64/3.12/standard)	1m 38s
	38m 43s

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