Add Timed Access Function

[ItIsAndrewL]

Overview

This PR creates a new function, active_test which when Dependency injected with FastAPI, locks down a route to only return a correct value when that team is within their testing bounds.

Features

• Added active_test function
• Updated /questions route to use this function
• Updated README documentation to reflect changes

Testing

Ran the /questions route to confirm that the new function works.