Main testing workflow

Fix some spelling in the README and add some info. #854

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Run time

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Job	Run time
build (3.8, ubuntu-latest)	2m 18s
build (3.8, windows-latest)	2m 9s
build (3.8, macos-latest)	2m 9s
build (3.9, ubuntu-latest)	2m 14s
build (3.9, windows-latest)	2m 9s
build (3.9, macos-latest)	2m 12s
build (3.10, ubuntu-latest)	2m 11s
build (3.10, windows-latest)	2m 3s
build (3.10, macos-latest)	2m 12s
build (3.11, ubuntu-latest)	2m 7s
build (3.11, windows-latest)	2m 7s
build (3.11, macos-latest)	1m 57s
build (3.12, ubuntu-latest)	2m 13s
build (3.12, windows-latest)	2m 9s
build (3.12, macos-latest)	2m 16s
build (pypy3.8, ubuntu-latest)	2m 15s
build (pypy3.8, windows-latest)	2m 10s
build (pypy3.8, macos-latest)	1s
build (pypy3.9, ubuntu-latest)	2m 14s
build (pypy3.9, windows-latest)	1s
build (pypy3.9, macos-latest)	1s
build (pypy3.10, ubuntu-latest)	2m 14s
build (pypy3.10, windows-latest)	2m 9s
build (pypy3.10, macos-latest)	1s
	43m 32s