support reading from RSS/Atom feeds
Since Repomaker should handle media files, one nice way to subscribe to a media feed is RSS/Atom. Then a vlog or something like that could easily be added to an fdroid repo. My guess is that this should not be much work on top of subscribing to fdroid repos. If it is a lot of work, it might not be worth the effort, since these formats seem to be fading in popularity.
The other hazard is that repomaker should never use RSS/Atom from an fdroid repo fdroidserver#299, but always the signed index.