[FEATURE REQUEST|DOCUMENTATION] Swagger docs

[LdDl]

Is your feature request related to a problem? Please describe.
Whould be cool to have swagger documentation for REST-part of applications

Describe the solution you'd like and provide pseudocode examples if you can
Use tool swag for doc generation + do route 'host:port/api/docs/' via Fiber for serving static files
Use rapidoc for visual representation of swagger specification

Describe alternatives you've considered and provide pseudocode examples if you can
nope

Additional context
nope