There is indeed a GETTING-STARTED.md file, and its relatively well-written, imho. It answers all sorts of things you may ask .. "There's no clear instructions" !true, imho.

EDIT: Plus, if you follow the documents in the sources (i.e. README and so on ..) you get to http://learnsemantic.com/ .. which is clearly a useful set of documents for developer needs. Quite some polish.