Draft PR of the file/directory structure

I managed to put together the structure as discussed on https://github.com/tooling/book-of-modern-frontend-tooling/issues/9#issuecomment-31289156, https://github.com/tooling/book-of-modern-frontend-tooling/issues/9#issuecomment-31270166 and the content mentioned on #15.

This may be subject to further revisions, feel free to post your thoughts/feedback around this.