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Add Homebrew installation instructions to README #8

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Run time

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Job	Run time
lint	32s
test	35s
build (linux, amd64)	11s
build (windows, amd64)	13s
build (darwin, amd64)	15s
build (darwin, arm64)	14s
build (windows, arm64)	8s
build (linux, arm64)	13s
	2m 21s