ENH: Convert README from ReStructured Text to MarkDown #231

Job	Run time
build-macos-python-packages (39)	3m 5s
build-macos-python-packages (310)	3m 27s
build-macos-python-packages (311)	1s
build-linux-python-packages (39)	3m 58s
build-test-cxx (ubuntu-22.04)	8m 47s
build-linux-python-packages (310)	3m 54s
build-test-cxx (windows-2022)	12m 58s
build-linux-python-packages (311)	4m 11s
build-test-cxx (macos-13)	10m 55s
build-windows-python-packages (9)	10m 10s
build-test-cxx (macos-14)	7m 14s
build-windows-python-packages (10)	10m 12s
build-windows-python-packages (11)	8m 1s
	1h 26m 53s

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