title: Correct way to add external jars (lib/*.jar) to an IntelliJ IDEA project
body: <p>When creating a new Java project in IntelliJ IDEA, the following directories and files are created:</p>
  
  <pre><code>./projectname.iml
  ./projectname.ipr
  ./projectname.iws
  ./src/
  </code></pre>
  
  <p>I want to configure IntelliJ IDEA to include my dependency JARs in <code>./lib/*.jar</code> to the project. What is the correct way to achieve this in IntelliJ IDEA?</p>