message: Document homebrew cask option for macOS installation
diff: @@ -67,6 +67,14 @@ emerge x11-terms/alacritty
  pkg install alacritty
  ```
  +### macOS
  +
  +```sh
  +brew cask install alacritty
  +```
  +
  +Once the cask is installed, it is recommended to setup the [manual page](INSTALL.md#manual-page), [shell completions](INSTALL.md#shell-completions), and [terminfo definitions](INSTALL.md#terminfo).
  +
  ### Other
  Prebuilt binaries for Linux, macOS, and Windows can be downloaded from the [GitHub releases page](https://github.com/jwilm/alacritty/releases).
  