updated README to start pull request for assignment 1

Required Tasks
[ ] 1. Follow the detailed instructions in the lecture slides to build and run Matchismo in the iPhone Simulator in Xcode 5. Do not proceed to the next steps unless your card flips back and forth as expected and builds without warnings or errors.

[ ] 2. Be sure to include all the code for the four classes shown in the first two lectures: `Card`, `Deck`, `PlayingCard`, and `PlayingCardDeck`. You must type this code in (e.g., do not copy and paste it from somewhere). The whole point of this required task is to gain experience editing code in Xcode and to get used to Objective-C syntax.

[ ] 3. Add a private property of type `Deck *` to the `CardGameViewController`.

[ ] 4. Use lazy instantiation to allocate and initialize this property (in the property's getter) so that it starts off with a full deck of `PlayingCards`.

[ ] 5. Matchismo so far only displays the `A♣` over and over. Fix Matchismo so that each time the card is flipped face up, it displays a different random card drawn from the `Deck` property you've created above. In other words, Matchismo should flip through and entire deck of playing cards in random order, showing each card one at a time.

[ ] 6. Do not break the existing functionality in Matchismo (e.g., the Flips counter should still continue to count flips).