Update on Graphics

I mentioned in #4 about redesigning the dice. What I didn't realise was that your dice are rendered from actual 3D models where as I thought they would just be images. It was those images that I was proposing to redesign for you, but alas 3D modelling is very much not my expertise. As an apology for the confusion, I fixed the problem with the README not rendering and tidied it up a little :)