Added startButton click event and AddEnemy() stub.
Finished AddEnemy().
Added AnimateEnemy().
Adjusted ContentControl position.
Added timer and captured fields.
Added timer tick event handler stubs.
enemyTimer tick method.
Added EndTheGame() method.
Added StartGame().
Put code in correct method.
Added correct code to enemyTimer().
Added PointerPressed event for human.
Added PointerEntered event handler for target.