Create Spotify Card for Main Activity

[philippelorange]

IMPORTANT: Please make this an EPIC using ZenHub and link appropriate tasks to it.

STORY CHECKLIST

• MockUps have been made an presented to the TA
• Story has been broken down into sub-tasks
• Story tasks have appropriate estimates (using Fibonacci)

Describe the user story
The Spotify functionality will work with a single Card on the Main Fragment of the app.
The Card must behave in the following ways:

• If the user did not authorize Spotify yet on Wikipedia, the Card should show "Connect to Spotify" with a Spotify logo;
• If the user did authorize Spotify, the Card should show regular song skipping/pausing buttons, the title of the song, the artist, and a button saying "Go To Artist".