created property numberOfCardsToMatch - will later replace with a button to set the number. Set value to three fro now when card is clicked.
updated the chooseCardAtIndex: method to receive the number of cards we are matching and sending the number from the controller.
Created a property to hold the cards that are chosen but not matched.
created getter for chosenNotMatchedCards.
Added the card that was just selected to the array
Have matching working using array.
scoring now works for 2 or 3 card games. Need to set button to send quantity.