Dolphinscheduler: [QUESTION] Write Documents

[cafechen]

*For better global communication, please give priority to using English description, thx! *

Describe the question
Improve development environment
documentation for the developers that tboy contributes:
https://github.com/apache/incubator-dolphinscheduler-website/blob/master/docs/zh-cn/1.2.0/user_doc/dolphin-scheduler-setup.md

Combine
https://github.com/apache/incubator-dolphinscheduler-website/blob/master/docs/zh-cn/development/submit-code.md

[cafechen]

I will do it this week.

[cafechen]

Done