Create property on CardGameViewController for the number of cards to match.
Use the abstract property numberOfCardsToMatch in the method touchCardButton.
Override abstract property numberOfCardsToMatch for PlayingCardGameViewController.
Create HistoryViewController
create turnHistoryDescriptions for the HistoryViewController.
Create view for HistoryViewController.
Change background color on HistoryViewController view.
Add text view to the HistoryViewController view.
Add navigation controller and readjust layout of Playing Card Matching Game.
Created PlayingCardMoveHistorySegue.
The turnDescriptions are now handled by the controller.
The turnDescription logic was removed from CardMatchingGame.
The original playing card matching game now works with history navigation.