Update README.md

Author: rossarmstrong

README.md

@@ -10,6 +10,7 @@ How to add ChatGPT's Text Completion functionality to Microsoft Word.
 ![](https://img.shields.io/badge/Maintained%3F-yes-green.svg)  
 ![Windows](https://img.shields.io/badge/Windows-0078D6?logo=windows&logoColor=white)  
 ![Microsoft Word](https://img.shields.io/badge/Microsoft_Word-2B579A?logo=microsoft-word&logoColor=white)  
+[![Documentation Status](https://readthedocs.org/projects/add-chatgpt-to-microsoft-word/badge/?version=latest)](https://add-chatgpt-to-microsoft-word.readthedocs.io/en/latest/?badge=latest)  
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 <!-- DESCRIPTION -->