chore: add lab for JS fundamentals (JS only)

[jdwilkin4]

There is a whole module just for reviewing the JS fundamentals before they moving onto working with the DOM and other concepts. Campers will have just finished the pyramid generator project here https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures-v8/learn-introductory-javascript-by-building-a-pyramid-generator/step-118

So we need a lab for them to do immediately after that. 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