Improvements to README and package.json

Well, after diving into the code to see what it does to make up a proper description, I couldn't resist documenting what is happening a bit.

I hope you like the result.

I'm quite unfamiliar with filesystem stuff, so I may have described things not entirely correct, or just awkwardly. Nevertheless, I hope that with this "template" you can make it right quickly.

There's good stuff inside, so it must show on the outside!