Document Windows support; fix Conda instructions #32

Job	Run time
Check Python 3.9 on ubuntu-20.04	10m 16s
Check Python 3.10 on ubuntu-20.04	10m 51s
Check Python 3.11 on ubuntu-20.04	10m 34s
Check Python 3.12 on ubuntu-20.04	11m 21s
Check Python 3.9 on macos-latest	8m 46s
Check Python 3.10 on macos-latest	7m 48s
Check Python 3.11 on macos-latest	8m 26s
Check Python 3.12 on macos-latest	8m 26s
Check Python 3.9 on windows-latest	10m 42s
Check Python 3.10 on windows-latest	18m 4s
Check Python 3.11 on windows-latest	13m 53s
Check Python 3.12 on windows-latest	13m 56s
	2h 13m 3s

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