Renamed doc to docs and minor language fixes

docs/examples/tapeables/lib/main.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:flame/game.dart';
+import 'package:flame/components/component.dart';
+import 'package:flame/components/mixins/tapable.dart';
+
+void main() {
+  final game = MyGame();
+
+  final widget = Container(
+    padding: const EdgeInsets.all(50),
+    color: const Color(0xFFA9A9A9),
+    child: game.widget,
+  );
+
+  runApp(widget);
+}
+
+class TapableSquare extends PositionComponent with Tapable {
+  static final Paint _white = Paint()..color = const Color(0xFFFFFFFF);
+  static final Paint _grey = Paint()..color = const Color(0xFFA5A5A5);
+
+  bool _beenPressed = false;
+
+  TapableSquare({double y = 100}) {
+    x = width = height = 100;
+    this.y = y;
+  }
+
+  @override
+  void update(double dt) {}
+
+  @override
+  void render(Canvas canvas) {
+    canvas.drawRect(toRect(), _beenPressed ? _grey : _white);
+  }
+
+  @override
+  void onTapUp(TapUpDetails details) {
+    _beenPressed = false;
+  }
+
+  @override
+  void onTapDown(TapDownDetails details) {
+    _beenPressed = true;
+  }
+
+  @override
+  void onTapCancel() {
+    _beenPressed = false;
+  }
+}
+
+class MyGame extends BaseGame {
+  MyGame() {
+    add(TapableSquare());
+    add(TapableSquare(y: 400));
+  }
+}