[AFA-7] Add documentation

[ricardopacheco]

Issue number: resolves #7

Summary 🔴

The idea is to be able to document endpoints following structure standards. For later ease and also to be well known and versatile, we will use swagger as a documentation standard for the endpoints, using the rswag dependency, also already integrated with integration tests (dispensing with current functional tests directly in the controllers).

Proposed / Possible solution 🔴

• Install and configure rswag and its dependencies in the project.

Checklist

• Install and configure rswag and its dependencies in the project.
• Document existing endpoints;
• Remove functional tests in controllers;

Additional

• Configure git hooks with overcommit to run necessary actions before a commit;
• Configure development setup to automatically install overcommit;
• Configure overcommit with the necessary options.