[Capstone] Define what it means to have a working API

[cimendes]

Context:
During the course of Batch 5, several students had issues with the Database connection, not being able to store any data, and having a very compromised report #2. According to our wiki, one of the criterium to pass the capstone is having a "working API". We need to better define this, and if the impossibility of saving any of the sent data is considered to be failing this criterium.

Goal(s):

• Define what is a "Working API" in terms of capstone evaluation

Acceptance criteria:

• Consensus has been reached regarding this issue
• Documentation in wiki has been updated to reflect the decision reached

[cimendes]

Most common API problems:

• endpoints are ill-defined (predict instead of predict/, or vice versa)
• Response is ill-structured (does not follow JSON structure guidelines)
• Database is unsuccessfully set up (records are not being stored, update endpoint always returns 404)