Basic docs structure

Reordered the docs folder and added `index.html` that generates a website based on the docs.

We probably will need to move/copy the documentation to the `gh-pages` branch, I'm leaving it here for now.

Open a console and run:
```
git checkout -b yemel-feature/docs v0.8
git pull https://github.com/yemel/bitcore.git feature/docs
cd docs
python -m SimpleHTTPServer
```

Point your browser to `http://localhost:8000/`