docs: Add installation method with gah #771

Job	Run time
Binary x86_64-unknown-linux-gnu (on ubuntu-latest)	50s
Binary x86_64-unknown-linux-musl (on ubuntu-latest)	52s
Binary aarch64-unknown-linux-gnu (on ubuntu-latest)	51s
Binary armv7-unknown-linux-musleabihf (on ubuntu-latest)	38s
Binary armv7-unknown-linux-gnueabihf (on ubuntu-latest)	1s
Binary x86_64-pc-windows-msvc (on windows-latest)	13s
Binary arm-unknown-linux-musleabihf (on ubuntu-latest)	40s
Binary aarch64-unknown-linux-musl (on ubuntu-latest)	1s
Binary x86_64-unknown-freebsd (on ubuntu-latest)	1s
Binary wasm32-unknown-unknown (on ubuntu-latest)	1s
Binary x86_64-apple-darwin (on macos-latest)	40s
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	4m 48s

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