title: How does the command "flutter create" work?
body: <p>I want to know how do all the files are generated when I execute <code>flutter create &lt;app_name&gt;</code> command.</p>
  <p>I've looked through <a href="https://github.com/flutter/flutter" rel="nofollow noreferrer">flutter/flutter repository</a> and <a href="https://github.com/flutter/engine" rel="nofollow noreferrer">flutter/engine repository</a> but couldn't find the answer.<br />
  I would like to customize the codes of <code>lib/main.dart</code> file when I create a new app, so I want to know where are the auto-generated files come from. Thanks for your help in advance.</p>