RMB-787 OL API and schema versioning guidance (#869)
RMB-787 OL API and schema versioning guidance (#869)

* OL API and schema versioning guide

* Update README.md per PR feedback

Co-authored-by: Adam Dickmeiss <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@indexdata.dk>

* Minor formatting change

Co-authored-by: Adam Dickmeiss <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@indexdata.dk>
folio-org/raml-module-builder,folio-org/raml-module-builder,folio-org/raml-module-builder