Update README.md

Author: seedante

README.md

@@ -19,10 +19,14 @@ Drag files in "Classes" folder into your project.
 ![set the delegate](https://raw.githubusercontent.com/seedante/SDECollectionViewAlbumTransition/PinchPopTransition/Config2.png)
 
 
-- At the last, add a line code in your UICollectionView's delegate:
+- At the last, add several lines code in your UICollectionView's delegate:
 
         override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
             self.selectedIndexPath = indexPath
+            let layoutAttributes = self.collectionView!.layoutAttributesForItemAtIndexPath(indexPath)
+            let areaRect = self.collectionView!.convertRect(layoutAttributes!.frame, toView: self.collectionView!.superview)
+            let toVC = ......
+            toVC.coverRectInSuperview = areaRect
             ...
         }