Margherita wrote:
thanks for precious tips!
it is what we're here for. 
Do you think it's better to have a git hub repository or to commit on
addons ?
personally I would suggest to commit directly to addons, but it is up to
you & your mentor to decide the best workflow.
I don't want to mess addons repository with not working code..
that's what it's there for.
theory:
https://trac.osgeo.org/grass/wiki/HowToContribute#WriteaccesstotheGRASS-Addons-SVNrepository
my method is to only add a working Makefile there when I feel the module
is ready for non-developers to use, but I think I might be alone in working
that way and don't ask that anyone follows that method.
Hamish