Collaboration Attentions

1. Please Fork this repo firstly and clone to your local computer.
2. If you have any idea and get codes running correctly, you can update the file to your forked repo and then pull request to this one. After checking I will merge your request if there is no problem. During writing codes, you need to pay your attention to:
   1. Make a profile of your code at the begining, including title, authors, creating data, etc.
   2. Use English to write comments in the code.
   3. Make TODO flags in your codes if it is not perfect. 
   4. If you are using Python, please comply with PEP8 format.