chore: add express middleware workshop prototype

[zairahira]

Checklist:

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

Closes #1047

[jdwilkin4]

This seems to simple IMO. I know the issue said short but I feel like campers won't really get enough practice working with middleware. Or really see the need for it.

I think something more complex will showcase why middleware is used. Also, this opens up the door for conversations around project structure because now we can introduce structuring your code with routes, controllers, and middleware folders