Add docs on how one can extend the Swagger docs

[Piedone]

As a module developer, what do I need to do to get my APIs into the Swagger docs? And after that, what do I need to do to display some nice documentation there for my API operations?

Please document under https://github.com/OrchardCoreContrib/OrchardCoreContrib.Modules/blob/dev/src/OrchardCoreContrib.Apis.Swagger/README.md

[hishamco]

This is a first release, there's a plan to extend Swagger to configure it's options, please refer to #34

what do I need to do to get my APIs into the Swagger docs?

This is good point to document

And after that, what do I need to do to display some nice documentation there for my API operations?

I suggest to refer to Swagger or ASP.NET Core docs, your thoughts?

[Piedone]

Sounds good.

[hishamco]

Fixed in e54e130