Migrate examples back, change to monorepo (#701)

examples/lib/stories/parallax/basic.dart

@@ -0,0 +1,22 @@
+import 'package:flame/components.dart';
+import 'package:flame/game.dart';
+
+class BasicParallaxGame extends BaseGame {
+  final _imageNames = [
+    'parallax/bg.png',
+    'parallax/mountain-far.png',
+    'parallax/mountains.png',
+    'parallax/trees.png',
+    'parallax/foreground-trees.png',
+  ];
+
+  @override
+  Future<void> onLoad() async {
+    final parallax = await loadParallaxComponent(
+      _imageNames,
+      baseVelocity: Vector2(20, 0),
+      velocityMultiplierDelta: Vector2(1.8, 1.0),
+    );
+    add(parallax);
+  }
+}