about.md: add contributor Rafael Fontenelle
As posted in F-Droid whiteboard in Weblate, I kindly ask to have my name posted on the About page. FWIW, I'm translator for Brazilian Portuguese (pt_BR) language.
As posted in F-Droid whiteboard in Weblate, I kindly ask to have my name posted on the About page. FWIW, I'm translator for Brazilian Portuguese (pt_BR) language.