Direct "Add to Playlist" Button in Now Playing Cover View

[Faeb35]

This Pull Request implements a new shortcut button in the Now Playing cover view to allow users to quickly add the currently playing track to a playlist.

As discussed in issue #93, I've added a new button to the control bar that overlays the bottom part of the album art.

• Current Workflow: To add the current track to a playlist, the user must currently navigate through several steps:
  1. Switch from the Cover View to the List View.
  2. Locate the current track in the list.
  3. Open the "More" menu (three dots).
  4. Select "Add to playlist".

[Faeb35]

@drawable/ic_action_add was already existing, but colored black

[paroj]

this fails in offline mode. Should we hide/ disable the button in this situation?

[Faeb35]

Thanks for noticing that. I will address it.