display images in markdown 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)

Example 3: add image in markdown

![alternative text](image_name.png "Image Title")

Example 4: Markdown image

![Text here](URL)