[Feature request] Add an RSS feed to Omnivore using an URL (API)

[odebroqueville]

Some browser extensions (e.g. RSS Button for Safari) automatically detect RSS feeds offered by a given website and offer to add the feeds to web-based RSS readers via a Custom URL.

Currently, it is not possible to use these browser extensions to add RSS feeds to Omnivore.

[anarcat]

this feels like a duplicate of #409

[odebroqueville]

this feels like a duplicate of #409

It's not at all the same thing: my understanding is that 409 is a request to obtain RSS feeds for a given article in Omnivore. This request is to be able to add an RSS feed to Omnivore using an URL.