docs(readme): update demo, api doc pages into readme file

Author: jojoee

README.md

@@ -11,7 +11,7 @@
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
 [![Greenkeeper badge](https://badges.greenkeeper.io/jojoee/leo-profanity.svg)](https://greenkeeper.io/)
 
-Profanity filter, based on "Shutterstock" dictionary
+Profanity filter, based on "Shutterstock" dictionary. [Demo page](https://jojoee.github.io/leo-profanity/), [API document page](https://jojoee.github.io/leo-profanity/doc/LeoProfanity.html)
 
 ## Installation