docs: desc

Author: jcs090218

README.md

@@ -6,6 +6,8 @@
 
 [![CI](https://github.com/emacs-openai/chatgpt-sideline/actions/workflows/test.yml/badge.svg)](https://github.com/emacs-openai/chatgpt-sideline/actions/workflows/test.yml)
 
+This Emacs package enhances the experience of another Emacs package, [chatgpt][].
+
 <p align="center">
 <img alt="demo" src="./etc/1.png"/>
 </p>
@@ -71,3 +73,6 @@ If you would like to contribute to this project, you may either
 clone and make pull requests to this repository. Or you can
 clone the project and establish your own branch of this tool.
 Any methods are welcome!
+
+
+[chatgpt]: https://github.com/emacs-openai/chatgpt