chore: add second functions lab to frontend cert (JS only)

[jdwilkin4]

Functions are a topic that confuse a lot of campers.
So we should have extra labs for this

The previous workshop and lecture videos will teach campers about functions.

Here is what they will know so far.

• let
• const
• assignment
• reassignment
• basic string usage
• console.log
• camelCase
• string concatenation using the + operator
• template literals
• str.length property
• bracket notation and retrieving characters from strings
• str.indexOf method
• Number()
• Math.floor
• Math.random
• getting a random number from a range
• prompt()
• ===
• if/else if/else
• true and false (truthy and falsey)
• comparison operators(< >=)
• logical operators (|| &&)
• array basics
• push
• pop
• shift
• unshift
• basic object usage
• for loop
• for of loop
• do/while loop
• while loop
• forEach loop
• regular functions
• arrow functions

Acceptance criteria

• create a new folder of the project in the frontend-cert/js-projects directory
• add your completed project in an script.js file in that new folder
• create a markdown file for your proposed user stories. You should call it user-stories.md and place it in your new project folder