Create a OpenAPI Generator

[allmightyspiff]

Should output something OpenAPI can use.

https://swagger.io/specification/

Example: https://github.com/OAI/OpenAPI-Specification/blob/main/examples/v3.0/api-with-examples.json
Editor: https://editor.swagger.io
Docs: https://swagger.io/specification/#paths-object

[allmightyspiff]

Added in #693