Added Arcade Shooter tutorial

Author: sujayvadlakonda

index.html

@@ -82,6 +82,7 @@ <h1>Tutorials</h1>
                     <li><a href="index.html?tutorial=tutorial-traveling-at-light-speed.html">Traveling at Light Speed</a></li>
                     <li><a href="index.html?tutorial=tutorial-primitives.html">Primitives</a></li>
                     <li><a href="index.html?tutorial=tutorial-animation.html">Animation</a></li>
+                    <li><a href="index.html?tutorial=tutorial-arcade-shooter.html">Arcade Shooter</a></li>
                 </ul>
             </div>
         </div>