Add readme for gai-backend #2688

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The `brew link` step did not complete successfully

Process completed with exit code 1.

Formula rustup-init was renamed to rustup.

Treating cmake as a formula. For the cask, use homebrew/cask/cmake or specify the `--cask` flag. To silence this message, use the `--formula` flag.

zstd 1.5.6 is already installed and up-to-date. To reinstall 1.5.6, run: brew reinstall zstd

python-packaging 24.2 is already installed and up-to-date. To reinstall 24.2, run: brew reinstall python-packaging

cmake 3.31.0 is already installed and up-to-date. To reinstall 3.31.0, run: brew reinstall cmake

rustup 1.27.1_1 is already installed and up-to-date. To reinstall 1.27.1_1, run: brew reinstall rustup