Expose a .well-known URI

[Gby56]

Describe the problem to be solved
Automatic discovery of API documentation portals is not easy, even with great documentation websites, automatically downloading the up-to-date schemas is not an easy task.

Describe the solution you'd like
My first idea is to use https://en.wikipedia.org/wiki/Well-known_URI

Either a /.well-known/apis.json or /.well-known/redoc.json would be enough, to get a simple list of documented APIs on the portal you're browsing, and get the list of specification files there too, to simply download the specifications.

Otherwise another URL path would be ok, a simple exampleportal.com/redoc.json would be nice

Describe alternatives you've considered
None

[adamaltman]

There is a proposed spec: https://apisjson.org/format/apisjson_0.17.txt

I haven't reviewed it in depth yet.

[jeremyfiel]

cc @kinlane

[kinlane]

Let me know where you need help @adamaltman -- 0.18 is latest and about to push 0.19. Thanks for nudge @jeremyfiel ;-)