Implement the base for the API

[Muffles]

Context
The basics for the API that will connect to Zomato and will be called from Slack.
We propose to use Express because it has tutorials to connect with Zomato. I should be easier

Right now, the goal is to have this connection working locally only. We don't need to put the API on the cloud yet.

Specific questions about APIs and concrete implementation can be made to Delio.

Tasks

• Implement the basics to have an API running locally.
• Create a GET endpoint that returns some text value, just to test the connection