Add support importing shared links from other apps

[nexus-gitss]

Is your feature request related to a problem? Please describe.
Please, add support for Offline reader support for read later posts. Recently Pocket shutdown. so basically there are not any reliable read it later app. If you support that, it makes Twine one of the best choice for me. Also, thank you for this asthetically pleasing and reliable free Rss reader app.

Describe the solution you'd like
Add support for Offline reader support for read later posts.

[msasikanth]

While it's not the core focus area of the app, I will keep it open for now, since I might pick it up in future.