Port Apple News to D8

Hey there! I was just added as co-maintainer. I am using this module for a D7 project and am busy getting some things changed in preparation for that (working on 7.x-2.x). I don't currently have need for the module in D8, so I personally have no plans to port it. If your interested in doing the port, I'd be happy to support you by reviewing patches and helping with direction.

@m4olivei thanks. could you create 8.x-1.x branch to issue patch against?

8.x-1.x branch has been opened, with some initial work on a port: https://cgit.drupalcode.org/applenews/log/?h=8.x-1.x

Here is an Initial port which has end to end new article post
Technical components:
1. Template config entity
2. Channel content entity with sections
3. The settings page for endpoint configurations.
4. Apple News field type and widget
5. Publisher - a wrapper for PublisherAPI provided by chapter-three/apple-news-api library
6. Few basic tests and base class for admin UI test

P.S: 8.x-1.x is not in the version drop down.

Thank you @m4olivei and @tbfisher for the co-maintainership. I have merged all changes to 8.x-1.x and release an alpha version.

w00t! Great news @vijaycs85!