Longhao‘s test-backend project has been completed

[HaoHaoP]

The code has been published online. http://www.haohaop.com For more information, please refer to the API Doc and README.md.

Completed the following bonus

• Write clear documentation on how it's designed and how to run the code.
• Write good in-code comments.
• Write good commit messages.
• An online demo.

[HaoHaoP]

I have fixed the above problem.

[xavierchow]

Thanks for the PR, closing.