Migrate examples back, change to monorepo (#701)

examples/lib/stories/components/composability.dart

@@ -0,0 +1,51 @@
+import 'package:flame/components.dart';
+import 'package:flame/game.dart';
+
+class Square extends PositionComponent with HasGameRef<Composability> {
+  Square(Vector2 position, Vector2 size, {double angle = 0}) {
+    this.position.setFrom(position);
+    this.size.setFrom(size);
+    this.angle = angle;
+  }
+}
+
+class ParentSquare extends Square {
+  ParentSquare(Vector2 position, Vector2 size) : super(position, size);
+
+  @override
+  void onMount() {
+    super.onMount();
+    createChildren();
+  }
+
+  void createChildren() {
+    // All positions here are in relation to the parent's position
+    final children = [
+      Square(Vector2(100, 100), Vector2(50, 50), angle: 2),
+      Square(Vector2(160, 100), Vector2(50, 50), angle: 3),
+      Square(Vector2(170, 150), Vector2(50, 50), angle: 4),
+      Square(Vector2(70, 200), Vector2(50, 50), angle: 5),
+    ];
+
+    children.forEach(addChild);
+  }
+}
+
+class Composability extends BaseGame {
+  ParentSquare _parent;
+
+  @override
+  bool debugMode = true;
+
+  Composability() {
+    _parent = ParentSquare(Vector2.all(200), Vector2.all(300));
+    _parent.anchor = Anchor.center;
+    add(_parent);
+  }
+
+  @override
+  void update(double dt) {
+    super.update(dt);
+    _parent.angle += dt;
+  }
+}