feat(doc): animations example

Author: NaejDoree

playground/graphics/graphics-5-animations.md

@@ -9,10 +9,13 @@ graphicEntityModule.createSpriteAnimation()
     .setImages(heroSprites)
     .setX(hero.getX())
     .setY(hero.getY())
-    .setDuration(2000)
+    .setDuration(100)
     .setLoop(true)
     .setPlaying(true);
 ```
+It should look like this :
+![Example](resources/hero.gif)
+
 - `setImages(heroSprites)`: set a `String` array containing the filenames of the sprites.
 - `setX(hero.getX())`, `setY(hero.getY())`: set the position.
 - `setDuration(2000)`: set how long the whole animation takes to be played (in milliseconds).