Updating dashbook and adding an example with info (#779)

examples/lib/stories/animations/animations.dart

@@ -6,12 +6,43 @@ import 'animation_group.dart';
 import 'aseprite.dart';
 import 'basic.dart';
 
+const basicInfo = '''
+Basic example of `SpriteAnimation`s use in Flame's `BaseGame`
+
+The snippet shows how an animation can be loaded and added to the game
+```
+class MyGame extends BaseGame {
+  @override
+  Future<void> onLoad() async {
+    final animation = await loadSpriteAnimation(
+      'animations/chopper.png',
+      SpriteAnimationData.sequenced(
+        amount: 4,
+        textureSize: Vector2.all(48),
+        stepTime: 0.15,
+      ),
+    );
+
+    final animationComponent = SpriteAnimationComponent(
+      animation: animation,
+      size: Vector2.all(100.0),
+    );
+
+    add(animationComponent);
+  }
+}
+```
+
+On this example, click or touch anywhere on the screen to dynamically add animations
+''';
+
 void addAnimationStories(Dashbook dashbook) {
   dashbook.storiesOf('Animations')
     ..add(
       'Basic Animations',
       (_) => GameWidget(game: BasicAnimations()),
       codeLink: baseLink('animations/basic.dart'),
+      info: basicInfo,
     )
     ..add(
       'Group animation',