how to add images in md file code example
Example 1: how to insert an image in markdown
![image info](./pictures/image.png)
Example 2: add image in markdown
![alternative text](image_name.png "Image Title")
Example 3: how to add image in readme.md
![alt text](http://url/to/img.png)
Example 4: how to add image in readme.md
![alt text](https://github.com/[username]/[reponame]/blob/[branch]/image.jpg?raw=true)