Update README.md

Author: flutter-clutter

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 # flutter_fruit_ninja_clone
 
+<p align="center">
+  <img height="400" src="http://www.flutterclutter.dev/images/posts/2020-07-24-flutter-game-tutorial-fruit-ninja-clone/flutter-fruit-ninja-clone.svg">
+</p>
+
 A basic clone of the popular game Fruit Ninja
 
-![https://www.flutterclutter.dev/images/wp-content/uploads/2020/07/flutter-fruit-ninja-final-result-small.gif](https://www.flutterclutter.dev/images/wp-content/uploads/2020/07/flutter-fruit-ninja-final-result-small.gif)
+<p align="center">
+  <img height="400" src="http://www.flutterclutter.dev/images/wp-content/uploads/2020/07/flutter-fruit-ninja-final-result-small.gif">
+</p>
 
 # Article