manage licenses manually

[spolti]

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.