[real-world uses] Add Kodit

Author: marijnh

doc/realworld.html

@@ -107,6 +107,7 @@ <h2>CodeMirror real-world uses</h2>
       <li><a href="http://www.jshint.com/">JSHint</a> (JS linter)</li>
       <li><a href="http://jumpseller.com/">Jumpseller</a> (online store builder)</li>
       <li><a href="http://kl1p.com/cmtest/1">kl1p</a> (paste service)</li>
+      <li><a href="http://www.kodhus.com/kodity/">Kodit</a></li>
       <li><a href="http://kodtest.com/">Kodtest</a> (HTML/JS/CSS playground)</li>
       <li><a href="http://try.kotlinlang.org">Kotlin</a> (web-based mini-IDE for Kotlin)</li>
       <li><a href="https://laborate.io/">Laborate</a> (collaborative coding)</li>