Add documentation

[bnvk]

Seems like a useful package, yet the README is skimpy on documentation. Is that elsewhere or does it still need to created?

[pwalsh]

Hi @bnvk yes, agreed :). We'll work on it. We pulled this code out of https://github.com/okfn/datapackagist. In the DataPackagist docs, the section on integrations gives an overview of how it works there (which may be slightly more useful than the README here :)).