Seed card objects, create deck object, create deck view.

Seeded card objects into database. Created Card#Create_deck method to initialize deck. Render the deck decks.erb view.
Added basic flash card game logic and database update after round

The round model and routes have been fleshed out to work:
-randomly selects 10 cards
-creates a Round record
-iterates through the cards, recording correct/incorrect answers
in the session
-after 10 questions, it then commits the user's performance
to the database
-It then routes to the user's stats page for the round