Insert image in GitHub README.md

When writing Github's Readme, it is often necessary to add pictures to assist descriptions.

First, save the required pictures in a local folder.

Second, push the local image to GitHub's remote repository.

Then, open the picture on GitHub to get the url of the picture.

Finally, enter the code in the following format in the Readme:

      xxx is the path of the image

![image](https://github.com/xxx/xxx/blob/master/xxx/xxx.png) 

can