The player has to move the mouse to control the left side player's paddle
Players toggles their respective paddles using the keyboard.
Player 1 uses 'W' key to move the left paddle UP
Player 1 uses 'S' key to move the left paddle DOWN
Player 2 uses 'ARROW UP' key to move the right paddle UP
Player 2 uses 'ARROW DOWN' key to move the right paddle DOWN