chore: add change event lab to frontend cert

[jdwilkin4]

We have a workshop and lecture videos to teach campers about the DOM and change events.

Here is the preceding workshop https://github.com/freeCodeCamp/CurriculumExpansion/pull/453

Campers will have already complete the previous fundamentals modules(strings, variables, arrays, numbers, Math object, objects, etc) So you can see the sheet for more details to see the complete list of what is covered.

For this lab, we want them to practice change events and adding HTML using innerHTML.

Acceptance criteria

• [ ] create a new folder of the project in the frontend-cert/js-projects directory
• [ ] add your completed project in an index.html, styles.css and script.js files 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