Update README.md with building instructions #186

Job	Run time
linting	1m 31s
formatting	5s
audit	6m 21s
build-and-test (ubuntu-latest, stable)	1m 32s
build-and-test (ubuntu-latest, beta)	1m 16s
build-and-test (macos-latest, stable)	1m 58s
build-and-test (macos-latest, beta)	1m 49s
build-and-test (windows-latest, stable)	3m 59s
build-and-test (windows-latest, beta)	3m 7s
build-and-test (ubuntu-latest, nightly)	1m 11s
build-and-test (ubuntu-latest, 1.70.0)	1m 42s
	24m 31s

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