docs: add cargo install instructions #612

Job	Run time
build (3.14)	4m 15s
build (3.11)	6m 19s
build (3.15)	3m 52s
build (3.13)	4m 25s
build (3.10)	8m 30s
build (3.12)	4m 29s
Indicate completion to coveralls.io	12s
	32m 2s

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