[Feature] display only unread articles

[oupala]

Is your feature request related to a problem? Please describe. When I have numerous articles in a feed, I sometime keep some old article unread for a long time.

Describe the solution you'd like I'd like to get a way to see only unread message, as already read messages are not that interesting.

Describe alternatives you've considered I was using EasyRSS that was proposing such feature.

As you can see on the screenshot, EasyRSS is proposing 3 views: starred articles only, all articles, unread articles only.