[New Feature] FeedFragment

[rurimo]

Implement a new FeedFragment.

Should be implemented..

• make entity models related to the GitHub API's feed model.
• get feed list via RESTful request using Retrofit.
• show the feed list on the RecyclerView (ViewHolder, RecyclerVew.Adapter).

How to implement?

1. Design the FeedService interface based on the GitHub API.
2. Define the FeedService on the NetworkModule.
3. Make FeedFragmentPresenter and getting the feed lists via RESTful request.
4. Shows the model items on the FeedFragment's RecyclerView. This library makes easy to implement adapter & viewholder. 😻
5. Maybe.. Pagination.