package: update README.md

README.md

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 Installing and using the package and defining all the utility methods can be found on the documentation page below: https://qsu.cdget.com/getting-started/installation-javascript
 
+## Family Packages
+
+As a family package of `qsu`, it can be installed and used independently of the `qsu` package.
+
+- **[qsu-fs](https://github.com/jooy2/qsu-fs)**: File listing and management utilities
+- **[qsu-web](https://github.com/jooy2/qsu-web)**: Utilities for website front-end & back-end services
+
+In addition, `qsu` is also available for the Dart language: https://github.com/jooy2/qsu-dart
+
 ## Contributing
 
 Anyone can contribute to the project by reporting new issues or submitting a pull request. For more information, please see [CONTRIBUTING.md](CONTRIBUTING.md).