Added a simple main menu using a Camera3D as well as a canvaslayer that has a transparent background so that the map can be seen. There was also a bug in the menu where if you pressed escape the level starts and zombies spawn even though play was not pressed. I fixed it by adding a script in the main menu so that pressing escape will not unpause the game and it will not register anything UNTIL the game has started then it will open up a pause menu if pressed and close the pause menu if pressed again.