title: How to add non-source folders to IntelliJ IDEA project
body: <p>Recently set up a multi module project in IntelliJ with the following structure:</p>
  <pre><code>/module1
  /module2
  /web-module
  /sql
  /lib
  /a few more folders
  </code></pre>
  <p>I set up module1+2 and web-module as modules in IntelliJ so those show up, but how do you make the sql and lib folder show up in the project panel? They should be included in VCS as well, but IntelliJ ignores them. How do you add folders outside modules to a project?</p>
  <p>Screenshot of project and explorer view:</p>
  <img src="https://i.imgur.com/bjqCF.png">