update animations README (#130)

* update animations README

* formatting

* formatting

* use bulleted list

animations/README.md

@@ -12,14 +12,32 @@ Sample apps that showcasing Flutter's animation features
 
 Building blocks and patterns
 
-**AnimationControllerDemo** Demonstrates how to use an `AnimationController`.
+1. **AnimatedContainerDemo** Demonstrates how to use `AnimatedContainer` 
+2. **PageRouteBuilderDemo** Demonstrates how to use `Tween` and `Animation` to
+*build a custom page route transition.
+3. **AnimationControllerDemo** Demonstrates how to use an `AnimationController`.
+4. **TweenDemo** Demonstrates how to use a `Tween` with an
+`AnimationController`.
+5. **AnimatedBuilderDemo** Demonstrates how to use an `AnimatedBuilder` with an
+`AnimationController`.
+6. **CustomTweenDemo** Demonstrates how to extend `Tween`.
+7. **TweenSequenceDemo** Demonstrates how to use `TweenSequence` to build a
+button that changes between different colors.
 
 ### Misc
 
 Other uses-cases and examples
 
-**ExpandCardDemo** Demonstrates how to use `AnimatedCrossFade` to fade between
+- **RepeatingAnimationDemo** Demonstrates how to repeat an animation.
+- **ExpandCardDemo** Demonstrates how to use `AnimatedCrossFade` to fade between
 two widgets and change the size.
+- **CarouselDemo** Demonstrates how to use `PageView` with a custom animation.
+- **FocusImageDemo** Demonstrates how to measure the size of a widget and expand
+it using a `PageRouteBuilder`.
+- **PhysicsCardDragDemo** Demonstrates how to run an AnimationController with a
+spring simulation.
+- **CardSwipeDemo** A swipeable card that demonstrates how to use gesture
+detection to drive an animation.
 
 ## Other Resources