Build

Add detailed build instructions to Readme #416

Job	Run time
ubuntu (20.04)	21m 50s
macOS (12, 3.9, 5.9.*, release)	8m 2s
ubuntu (22.04)	18m 25s
oldschool (centos, 7, python-debug, debug)	5m 14s
macOS (12, 3.9, 5.9.*, debug)	3m 7s
oldschool (centos, 7, python-debug, release)	5m 8s
macOS (12, 3.11, 5.12.*, debug)	5m 7s
oldschool (rockylinux, 9, python3-devel, release)	4m 29s
windows (win64_mingw73, 3.10, 5.12.*, x64)	6m 3s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 42s
windows (win64_msvc2019_64, 3.12, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 6s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 13s
	1h 32m 26s

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