Encourage documentation of QC pipeline by providing a blueprint

Maybe we can add a section in the README-editors.md, or create a [seperate doc ala HPO](https://github.com/obophenotype/human-phenotype-ontology/blob/master/src/ontology/QC.md). In any case it would be good if QC is clearly explained somewhere (on a by ontology basis, thinking of configurable ROBOT report levels and so on).

Start by reading README-editors.md and the linked HPO QC.md example. Document how QC works on a per-ontology basis, including configurable ROBOT report levels. Done means the QC process and configuration options are clearly explained in an appropriate project document.

Written by the indexing model from the issue text.