add Homebrew installation instructions #521

Job	Run time
check-clippy (ubuntu-latest)	17s
test (ubuntu-latest, 1.74.0)	51s
check-clippy (macos-latest)	16s
test (ubuntu-latest, stable)	43s
check-format	3s
security-audit	2m 40s
check-clippy (windows-latest)	18s
test (macos-latest, 1.74.0)	52s
test (macos-latest, stable)	43s
test (windows-latest, 1.74.0)	1m 52s
test-install-file-association	2m 1s
upload-debug-builds (ubuntu-latest)	18s
test (windows-latest, stable)	2m 36s
test-examples (ubuntu-latest, 1.74.0)	1m 1s
upload-debug-builds (macos-latest)	20s
test-examples (ubuntu-latest, stable)	58s
upload-debug-builds (windows-latest)	1m 43s
test-examples (macos-latest, 1.74.0)	1m 2s
test-examples (macos-latest, stable)	54s
	19m 28s

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