Test

Move long usage guide from README to `docs` module #256

Job	Run time
rust-1point65-build-and-test (ubuntu-latest)	5m 31s
rust-stable-build-and-test (ubuntu-latest)	2m 35s
rust-1point65-build-and-test (windows-latest)	6m 17s
rust-stable-build-and-test (windows-latest)	3m 57s
rust-1point65-build-and-test (macos-latest)	4m 25s
rust-stable-build-and-test (macos-latest)	1m 57s
	24m 42s

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