[real-world uses] Add Cloud Commander

Author: coderaiser

doc/realworld.html

@@ -42,6 +42,7 @@ <h2>CodeMirror real-world uses</h2>
       <li><a href="https://developers.google.com/chrome-developer-tools/">Chrome DevTools</a></li>
       <li><a href="http://clickhelp.co/">ClickHelp</a> (technical writing tool)</li>
       <li><a href="https://encap.github.io/clone-it/">Clone-It</a> (HTML & CSS learning game)</li>
+      <li><a href="https://cloudcmd.io">Cloud Commander</a> (filemanager for the web)</li>
       <li><a href="https://electronjs.org/apps/colon">Colon</a> (A flexible text editor or IDE)</li>
       <li><a href="http://code.world/">CodeWorld</a> (Haskell playground)</li>
       <li><a href="http://complete-ly.appspot.com/playground/code.playground.html">Complete.ly playground</a></li>