add images to markdoqwn code example
Example 1: how to insert an image in markdown
![image info](./pictures/image.png)
Example 2: markdown embed image
![Image of Yaktocat](https://octodex.github.com/images/yaktocat.png)
![image info](./pictures/image.png)
![Image of Yaktocat](https://octodex.github.com/images/yaktocat.png)