chore: add calculator workshop to teach functions in frontend cert(JS only)

[jdwilkin4]

The frontend cert will have a module just for functions. There will be a lecture block going into more detail about how to work with functions and arrow functions works with examples. But we need a short(like 40 steps or less) workshop, for them to learn about loops interactively.

A good project for this would be a simple calculator app where campers will create functions for addition, subtraction, multiplication, and division.

This will be complete list of concepts campers will know about so far before this workshop:

• 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

Acceptance criteria

• [x] create a new folder of the project in the frontend-cert/js-projects directory
• [x] add your completed project in an script.js file in that new folder