Add connexion python (open)api first web framework #82
Description
Connexion is a modern Python web framework that makes spec-first and api-first development easy.
Project : https://github.com/spec-first/connexion
- Write openapi doc
- Use openapi-generator with "python-aiohttp" template to generate and re-generate boilerplate code of base connexion web service and relate controllers and api models.