Add Raven Reader to native apps list

[math-GH]

The Raven reader is not yet on our list of native apps.

Google Reader API support. Supports self hosted RSS Services like FreshRSS.org etc. (Folders are WIP)

website:
https://ravenreader.app/

Source:
https://github.com/hello-efficiency-inc/raven-reader

I see that the repository is "archived", but last release was in 2023 and some little improvements are still in progress (see the PRs)

Operating systems: Windows, Linux, MacOS