We're going to build a vertical shmup (shoot 'em up). Every version will get more and more complete, and every version will have a couple of bugs that you need to fix. Our goal in this first step is add a player's ship, and make it move around. Once you click the flag, the player should be able to control the ship via the wasd keys. Also, there are two sprites for the player's ship so that we can make it look like the rocket is firing. There are two bugs in this step that you need to fix. 1) The ship does not fly to the right when you press 'd' 2) The fire on the back of the ship is not flickering
