p5.js is an exciting new project to create interactive apps for the web. Check out this video to get an idea of what you can do with it:

http://hello.p5js.org/

For this task, read the p5.js tutorials:

http://p5js.org/learn/

and write a blog post or create a youtube guide describing your experience with it and a list of steps that could help other kids to get started with it quickly.