Add Rest API

[mr-eggleton]

Make it REST and OpenAPI compliant Maybe using techniques from https://medium.com/analytics-vidhya/building-rest-apis-using-flask-restplus-sqlalchemy-marshmallow-cff76b202bfb

We could then use

• https://github.com/KissPeter/APIFuzzer
• https://github.com/ninofiliu/oa-client#getting-started or https://github.com/mikestead/openapi-client

[mr-eggleton]

That original technique didn't want to install.

This one looks cleaner. https://github.com/X1Zeth2X/flask-restx-boilerplate