Adding basic SVG support (#61)

doc/examples/svg/lib/main.dart

@@ -0,0 +1,35 @@
+import 'package:flame/game.dart';
+import 'package:flame/svg.dart';
+import 'package:flame/position.dart';
+import 'package:flame/components/component.dart' show SvgComponent;
+
+import 'package:flutter/material.dart';
+
+void main() => runApp(MyGame());
+
+class MyGame extends BaseGame {
+
+  Svg svgInstance;
+  SvgComponent android;
+
+  MyGame() {
+    _start();
+  }
+
+  _start() async {
+    svgInstance = Svg('android.svg');
+    android = SvgComponent.fromSvg(100, 100, svgInstance);
+    android.x = 100;
+    android.y = 100;
+
+    add(android);
+  }
+
+  @override
+  void render(Canvas canvas) {
+    super.render(canvas);
+
+    svgInstance.renderPosition(canvas, Position(100, 200), 300, 300);
+  }
+
+}