title: Equivalent of "android.library=true" in Android Studio
body: <p>I am new to Android Studio and IntelliJ Idea, as a previous Eclipse user.</p>
  
  <p>The module I'd like to add as a dependency to another module doesn't show up in the list of dependencies available to add to the project.  </p>
  
  <p>In Eclipse, inserting android.library=true in project.properties will enable it to be added as a dependency.  How does one make it show up in the available dependency module list in Android Studio?</p>
  
  <p>Thanks.</p>