feat: create yelp nightlife api

[a2937]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Relates to #618

On hindsight, asking campers to download a 4GB data source seems like a terrible idea and I also think that requiring campers to sign up for a free trial to Yelp is a terrible idea especially for an academic project.

This is where this project comes in. We serve our own mini API that mimics Yelp and has the routes needed to help campers fulfill the assignment requirements.

I copied over the starter files from the twitch project and still need to finalize the data and routes. But it looks like a decent starter.