how to have a mentor and send scm files modified to the responsible for the development

[hassan . elfatihi]

Hello everybody
I installed lilypond-git and I made changes to the files
Lily-library.scm and define-note-names.scm. In addition I have added a file
 Hel_arabic_makam.ly an altenative to arabic.ly. 
I tested these files and it works very well.
I would like to know how to make changes
To those responsible for the development of lilypond.
And How to have a mentor
thank you very much
hassan el fatihi