Merge branch 'master' of https://github.com/wj-Mcat/code-generator

CONTRIBUTING.md

+To contribute this project, you should :
+1. creating your issue to describe your promotion, and discussing with members about details
+2. creating pull request to complete the promotion
+3. waiting that members of this project review the code in pr.
+4. finally, if the code is merged into master branch, you are the member of the this project.