Add screenshots to documentation (#2968)

* Added missing screenshots/gifs from /examples

* Updated readme for examples

* Changed screenshot size to have equal width for all screenshots

examples/README.md

@@ -16,6 +16,22 @@ Featuring:
 - ASCollectionView batch API
 - ASDelegateProxy
 
+### ASDKgram [ObjC]
+
+![ASDKgram Example App Screenshot](./Screenshots/ASDKgram.png?raw=true)
+
+### ASDKLayoutTransition [ObjC]
+
+![ASDKLayoutTransition Example App](./Screenshots/ASDKLayoutTransition.gif?raw=true)
+
+### ASDKTube [ObjC]
+
+![ASDKTube Example App](./Screenshots/ASDKTube.gif?raw=true)
+
+### ASMapNode [ObjC]
+
+![ASMapNode Example App Screenshot](./Screenshots/ASMapNode.png?raw=true)
+
 ### ASTableViewStressTest [ObjC]
 
 ![ASTableViewStressTest Example App Screenshot](./Screenshots/ASTableViewStressTest.png?raw=true)
@@ -30,6 +46,10 @@ Featuring:
 - ASMultiplexImageNode
 - ASLayoutSpec
 
+### AsyncDisplayKitOverview [ObjC]
+
+![AsyncDisplayKitOverview Example App Screenshot](./Screenshots/AsyncDisplayKitOverview.png?raw=true)
+
 ### BackgroundPropertySetting [Swift]
 
 ![BackgroundPropertySetting Example App gif](./Screenshots/BackgroundPropertySetting.gif?raw=true)
@@ -61,7 +81,7 @@ Featuring:
 - ASLayoutSpec
 - ASMultiplexImageNode
 
-### CustomCollectionView [ObjC]
+### CustomCollectionView [ObjC+Swift]
 
 ![CustomCollectionView Example App gif](./Screenshots/CustomCollectionView.gif?raw=true)
  
@@ -93,9 +113,13 @@ Featuring:
 - UIViewController with ASTableView
 - ASCellNodes with ASNetworkImageNode and ASTextNode
 
+### LayoutSpecPlayground [ObjC]
+
+![LayoutSpecPlayground Example App Screenshot](./Screenshots/LayoutSpecPlayground.png?raw=true)
+
 ### Multiplex [ObjC]
 
-![Multiplex Example App gif](./Screenshots/Multiplex.gif?raw=true)
+![Multiplex Example App](./Screenshots/Multiplex.gif?raw=true)
  
 Featuring:
 - ASMultiplexImageNode (with artificial delay inserted)
@@ -103,6 +127,8 @@ Featuring:
 
 ### PagerNode [ObjC]
 
+![PagerNode Example App](./Screenshots/PagerNode.gif?raw=true)
+
 Featuring:
 - ASPagerNode
 
@@ -156,7 +182,7 @@ cell types may be appropriate to display to the user with placeholders, whereas
 
 ### VerticalWithinHorizontalScrolling [ObjC]
 
-![VerticalWithinHorizontalScrolling Example App Screenshot](./Screenshots/VerticalWithinHorizontalScrolling.png?raw=true)
+![VerticalWithinHorizontalScrolling Example App](./Screenshots/VerticalWithinHorizontalScrolling.gif?raw=true)
 
 Features:
 - UIViewController containing ASPagerNode containing ASTableNodes