Markdown 如何添加并列的两列图片
参考：
https://stackoverflow.com/questions/24319505/how-can-one-display-images-side-by-side-in-a-github-readme-md
https://stackoverflow.com/questions/15367332/how-to-use-pandoc-image-alignment-to-align-two-images-in-the-same-row
参考：
https://stackoverflow.com/questions/24319505/how-can-one-display-images-side-by-side-in-a-github-readme-md
https://stackoverflow.com/questions/15367332/how-to-use-pandoc-image-alignment-to-align-two-images-in-the-same-row
