chore(examples): add dnd

example/src/index.js

@@ -18,6 +18,7 @@ import NodeTypeChange from './NodeTypeChange';
 import UpdatableEdge from './UpdatableEdge';
 import UpdateNode from './UpdateNode';
 import SaveRestore from './SaveRestore';
+import DragNDrop from './DragNDrop';
 
 import './index.css';
 
@@ -86,6 +87,10 @@ const routes = [
     path: '/save-restore',
     component: SaveRestore,
   },
+  {
+    path: '/drag-and-drop',
+    component: DragNDrop,
+  },
 ];
 
 const Header = withRouter(({ history, location }) => {