docs: add chromatic link

Author: awran5

README.md

@@ -193,6 +193,8 @@ const MyComponent = () => {
 
 ### [Demo](https://react-simple-typewriter.vercel.app/)
 
+### [Chromatic Demo](https://631a3c2d9ac934a87ceddffb-omsskndxeg.chromatic.com/)
+
 <br />
 
 [![Edit react-simple-typewriter](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/react-simple-typewriter-uj8ix?fontsize=14&hidenavigation=1&theme=dark)