add github readme code example
Example 1: how to add gif in github readme
![](http://i.imgur.com/OUkLi.gif)
![](http://i.imgur.com/Ssfp7.gif)
![](http://i.imgur.com/60bts.gif)
Example 2: add gif github readme
![Alt Text](https://media.giphy.com/media/vFKqnCdLPNOKc/giphy.gif)