How To add http endpoints not based on a domain entity

[liorbalmas]

Hi,
I need to create an endpoint that simply creates a pdf file on the filesystem. There's no domain and db here.
In the docs the examples use CrudAppService with a domain entity, and endpoints are created automatically.
I tried to create an the controller manually but couldn't see it in swagger.
How can endpoints can be created manually for cases such as this one?

Generally asking, Is abp suitable for APIs that are more of a utilities apis without Domain and DB Layers?
I hope the answer is yes because of other advantages of the framework

Thanks a lot