add image link in md file code example
Example 1: markdown embed image
![Image of Yaktocat](https://octodex.github.com/images/yaktocat.png)
Example 2: add image in markdown
![alternative text](image_name.png "Image Title")
![Image of Yaktocat](https://octodex.github.com/images/yaktocat.png)
![alternative text](image_name.png "Image Title")