Add Geography Author API

[marie-x]

Is your feature request related to a problem? Please describe.

Geography API objects (GeoJSON blobs) are currently served via a simple read-only API, or via flat-file. The mechanism for creating, modifying, and deprecating the GeoJSON is not specified.

While no one mechanism should be the exclusive API for authoring Geography objects, having a standard would enable multiple types of tools and front-ends to connect to any MDS system supporting that standard.

Is this a breaking change

• No, not breaking

Impacted Spec

This would complement the Geography spec, but without affecting it.

Describe alternatives you've considered

This is a nice-to-have spec, not a must-have.

Additional context

None