Update README.md

Author: JE-Chen

README.md

@@ -3,6 +3,7 @@
 [![Python 3.10+](https://img.shields.io/badge/python-3.10%2B-blue.svg)](https://www.python.org/downloads/)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)
 [![PySide6](https://img.shields.io/badge/GUI-PySide6-green.svg)](https://doc.qt.io/qtforpython/)
+[![Documentation](https://readthedocs.org/projects/pybreeze/badge/?version=latest)](https://pybreeze.readthedocs.io/en/latest/index.html)
 
 [繁體中文](README/README_zh-TW.md) | [简体中文](README/README_zh-CN.md)