Adding Roles, DodgeballPlayer, Position

- Added Roles, which have base stats and current stats. Not sure if
current stats belong on a Role
- Added DodgeballPlayer, which has a Role, a Position, and an
InOutStatus
- Added a simple Position object that tracks the x and y coords in whole
numbers
- Added a DistanceCalculator to calculate the distance between two
Positions
- Modified the AssemblyInfo for the DodgeballGame project to show
internals to DodgeballGame.Tests