Add homebrew installation instructions (#27)

Co-authored-by: Han Cen <[email protected]>

README.md

@@ -15,13 +15,13 @@ This is a fork of the [original Glance plugin](https://github.com/samuelmeuli/gl
 
 The installation is slightly complex as the package is not notarized. The steps are as follows:
 
-1. Download the `.dmg` file from GitHub [releases](https://github.com/chamburr/glance/releases) page.
-2. Open the file and move Glance.app to the Applications folder.
-4. Open a terminal and run the following command.
+1. Download the `.dmg` file from [releases](https://github.com/chamburr/glance/releases), open the file and drag Glance.app to Applications.
+2. Alternatively, install Glance through Homebrew using `brew install glance-chamburr`.
+3. Open a terminal and run the following command.
  ```sh
  xattr -rd com.apple.quarantine /Applications/Glance.app
  ```
-5. Launch Glance. Enjoy!
+4. Launch Glance. Enjoy!
 
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