GitLab Merge Request Feature: Add automatic checklist for developers

@chi-tuan.pham and @boris.basic there should be a way to setup a checklist for developers? Like it's done on conda-forge.

There systematic checks to do when implementing a new feature on openTELEMAC. Like at least:

• I checked the implementation in serial and parallel
• I added documentation
• I added a test case (new feature implementation)
• I have described my implementation in NEWS.txt

@nicolas.godet, do you have any idea about this ?