adding a file tree structure to chapters of the book[ENHANCEMENT]

[yusharth]

Hey community, I was reading the documentation and thought won't it be pretty easy ,if one(maybe me) put file tree structure in the initial documentation "The Structure of a three.js App"?
something like this:
--src
|-index.html
|-src
|-main.js
|-stylles
|-main.css
Just a suggestion, I may not be right or misinterpreted the goal of the tutorials.

[looeee]

That would be a great addition, go for it!