add pickups

lib/pages/manual/manual_page.dart

@@ -49,6 +49,10 @@ class _ManualPageState extends State<ManualPage> {
       inAsyncCall: _isLoading,
       child: Scaffold(
         appBar: AppBar(
+          leading: new IconButton(
+            icon: new Icon(Icons.close, color: secondaryColor),
+            onPressed: () => Navigator.of(context).pop(),
+          ),
           title: Text(widget.marketplace == null ? '' : widget.marketplace),
           backgroundColor: primaryColor,
         ),