changes project to 52-2015 prework. adds a tonne of new things

readme.md
 - adds the readme file, barebones

src/Ball.hx
 - adds a ball, it will randomly pick an angle from 0-2PI and then start moving. It will bounce off the walls but not the paddles and will not be destroyed or score. bases its workable area based on the GameBoard

src/GameBoard.hx
 - creates a GameBoard class, this is the are where the paddles and the ball can move. all game objects will have a reference to this object were they can do collisions agains the gameboard size and placement.

src/GameState.hx
 - moved everything to its own class to clean the code

src/Paddle.hx
 - created a paddle class
 - "w" and "S" keys move the paddle and the GameBoard limits the movement of the paddle.