anchor.diff:  
   a(id='file-tree')
   :marked
  -  Folder and File Structure
  +  Here is a compliant folder and file structure
   
   .filetree
  -  .file src
  +  .file &lt;project root&gt;
     .children
       .file app
       .children
  
positive.code:         .file villains.module.ts
          .file villains-routing.module.ts
        .file app.component.ts|html|css|spec.ts
      .file app.module.ts
      .file app-routing.module.ts
      .file main.ts
      .file index.html
      .file ...
  
negative.code: 
  .s-rule.do
    :marked
      **Do** create an Angular module in the app's root folder (e.g., in `/app`).
  
  .s-why
    :marked
      **Why?** Every app requires at least one root Angular module.
  
  .s-rule.consider
    :marked
  