add drawer to every page

covas_mobile/lib/pages/DisplayPictureScreen.dart

@@ -12,6 +12,7 @@ import 'UpdateEventImage.dart';
 import 'dart:convert';
 
 import '../variable/globals.dart' as globals;
+import '../classes/MyDrawer.dart';
 
 void main() {
   runApp(MyApp());
@@ -158,6 +159,8 @@ class DisplayPictureScreenState extends State<DisplayPictureScreen>
         appBar: AppBar(title: const Text('Display the Picture')),
         // The image is stored as a file on the device. Use the `Image.file`
         // constructor with the given path to display the image.
+        drawer: MyDrawer(),
+
         body: Padding(
             padding: const EdgeInsets.all(20.0),
             child: Column(