resource discovery / swagger / openapi / etc.

[jmmccasland]

We should expose an endpoint that allows OpenAPI explorers such as https://inspector.swagger.io/builder?url=https%3A%2F%2Fswapi.co%2Fapi%2Fpeople work out of the box with JSONAPI-TS

[rtablada]

https://blog.runscope.com/posts/getting-started-with-the-openapi-specification

[joelalejandro]

Discussed in #267

^{Originally posted by isBatak February 23, 2021}
How hard would it be to expose resource schemas via API so the frontend can build a CLI tool for building Resource definitions used in frontend clients?

Following up on this issue - @isBatak we might try to implement something based on json-api/json-api#1447. If we build upon describedby, we'd probably use your work on #275 as a base.