0.7 pause menu added. (basic function)

Play Screen:

1. Added the basic function of the pause menu
   1. I need to update the button when using the UI to close the pause menu
   2. I need to add more buttons to the pause menu
      1. Exit game
         1. triggers the gameover so the current score is saved (if you have a new highscore but have to leave suddenly)
      2. Options button
      3. Controls button