Introduce API-Docu, build automatically

[aeimer]

User Story

As a:

Developer

I want:

to have an API-Documentation

so that:

I can see all URL-Paths and their functions.

Acceptance criteria:

• All API-Functions are commented
• Build the Documentation on build time
• The documentation should be generated only on tagged builds
• Publish the build (as GH Pages)
• The version of the docu should be switched

Additional info:

https://pages.github.com/

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Please tag this issue if you are sure to which tag(s) it belongs.

[micpah]

• https://swagger.io/
• https://stackoverflow.com/questions/31300756/can-swagger-autogenerate-its-yaml-based-on-existing-express-routes
• https://github.com/RSuter/NSwag