title: Summernote Special Char Button
body: <ol>
  <li>I want to add a custom button to Summernote WYSIWYG editor.</li>
  <li>This button will popup a little window containing special characters like: alpha - beta - degree etc.</li>
  </ol>
  
  <p>I have look everywhere but was not able to find anything about this.
  A hand would be appreciated.</p>