Added static tileScale to Tile class

Added the static variable tileScale to Tile class. Also added the
solution files for the empty.png added earlier.
Changes to Player class

Removed redundant no-arg constructor. Removed the loading of the sprite
from LoadPlayer method. The texture must now be passed to constructor.
Added GetLevel() to Level class

Added a simple GetLevel() method to Level class.
Added placeholder material to Game1

Added temporary level, temporary level creation, and associated Player
methods in Update and Draw to show mechanics of Player class.