Support FreshRSS API

[BadCo-NZ]

Checklist

• [x] I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• [x] This issue contains only one feature request. I will open one issue for every feature I want to request.

What feature do you want?

Support for FreshRSS (Fever) API

https://freshrss.github.io/FreshRSS/en/developers/06_Fever_API.html

Why do you want this feature?

Currently other RSS clients are not satisfying my needs. ReaDrops is OK but could do with some improvents.

[joelchrono12]

I would love for this to happen. supporting fever or google reader api would be awesome_