Github Docs / README

[crijke]

Provide more information on the architecture of the code and how queries are evaluated as a reference for current and future code contributors.

Cleanup/Complete all READMEs, explain the projects, getting started info.

[dpprdan]

Not sure whether it fits in here, but in general a visualisation of the data pipeline would be quite helpful. Not least regarding where a bug should/could best be filed and addressed.

E.g. am I right to assume that https://github.com/datenguide/genesapi-tabular builds on https://github.com/datenguide/datenguide-api?