how to add image in readme.md

If you want to embed images, this is how you do it:

![Image of Yaktocat](https://octodex.github.com/images/yaktocat.png)

![GitHub Logo](/images/logo.png)
Format: ![Alt Text](url)

![alt text](https://github.com/[username]/[reponame]/blob/[branch]/image.jpg?raw=true)