added inital chart.js support

frontend/index.html

@@ -120,6 +120,7 @@
   </div>
   <script src="lib/bootstrap.bundle.min.js"></script>
   <script src="lib/jquery-3.3.1.min.js"></script>
+  <script src="lib/chart.bundle.js"></script>
   <script src="frontend.js"></script>
 </body>