Add the freely available notation fonts to the repository

[uliska]

At least some fonts should be available here.

[svavilov]

I'm not sure to which extent it was done, would be great yes, to have a place to look comfortably.

Any suggestions where to find Handwritten music fonts for Lilypond?
I sound some threads here
https://lists.gnu.org/archive/html/lilypond-user/2014-07/msg00652.html
https://www.scoringnotes.com/meta/a-fount-of-fonts-at-notation-central/