CityViewTutorial

When first entering the cityview the tutorial screen should appear
 * 20141109_202713.jpg the left a text block welcoming the player the city view and explain how their choices will affect the game.
 * In the middle a billboard (use one of the 3d billboard models already made) that visually shows how to build.
 * On the right a text block that step by step explains what to do (corresponds with the visuals on the billboard).
 * Exit tutorial button

Alternative billboard suggestion if needed.