manage licenses automatically

**Describe the bug**
Manage licenses in java projects can be tricky and one a while a few files are merged without it.
Use [1] to avoid such scenarios to happen 

[1] https://github.com/mathieucarbou/license-maven-plugin/


**Expected behavior**
A clear and concise description of what you expected to happen.


**Additional context**
Add any other context about the problem here.
