Adding ability to favorite - double tap with Tap Gesture
changed tap gesture recognizer to recognize two taps - feature in storyboard
Instead of using the TapGesture, added a delegate method for the Collection View: didSelectItemAtIndexPath
adding bar button for favorites, a new image view, and setting up the segue to pass over the favorited images
New class for Favorites VC set up as type UICollectionVC, CollectionVC added to storyboard, reusable ID set up, class for new VC set to the new file of Favorites VC