Update Homebrew installation instructions (#9356)

This PR updates the README to include Homebrew installation instructions
for the preview version and adds a link to the Homebrew homepage.

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

README.md

@@ -14,11 +14,19 @@ Support for additional platforms is on our [roadmap](https://zed.dev/roadmap):
 - Windows ([tracking issue](https://github.com/zed-industries/zed/issues/5394))
 - Web ([tracking issue](https://github.com/zed-industries/zed/issues/5396))
 
-For macOS users, you can also install Zed from Homebrew:
+For macOS users, you can also install Zed using [Homebrew](https://brew.sh/):
+
 ```sh
 brew install zed
 ```
 
+Alternatively, to install the Preview release:
+
+```sh
+brew tap homebrew/cask-versions
+brew install zed-preview
+```
+
 ## Developing Zed
 
 - [Building Zed for macOS](./docs/src/developing_zed__building_zed_macos.md)