fix: demo

Author: nitzano

README.md

@@ -18,8 +18,12 @@ Add accessibility reading panel to any website!
 [![GitHub Repo stars](https://img.shields.io/github/stars/nitzano/react-reading-panel?style=flat)](https://github.com/nitzano/react-reading-panel/stargazers)
 ![npm](https://img.shields.io/npm/dw/react-reading-panel)
 
+![Demo](https://github.com/nitzano/react-reading-panel/blob/bf4fe0dbdae44067d70b107a8d6863572ef6c90d/docs/demo.gif?raw=true)
+
+
 </div>
 
+
 # Main Features
 
 1. Change font size