Setup Swagger for our NestJs Server

[frattezi]

Description

We want to have a nice setup for OpenAPI and Swagger in our project, so we can use it while creating new API`s:

References:

• https://docs.nestjs.com/openapi/introduction
• https://docs.nestjs.com/openapi/mapped-types

Requirements:

• Map our current controller endpoints into swagger nestjs pattern.
• Add documentation associated to readme about the pattern and code rules