Authentication check plus signin screen added to frontend

Frontend/patient_manager/lib/components/myAppBar.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:patient_manager/main.dart';
 
 class MyAppBar extends StatelessWidget {
   final String barTitle;
@@ -11,6 +12,15 @@ class MyAppBar extends StatelessWidget {
       backgroundColor: Colors.blueAccent,
       elevation: 8,
       shadowColor: Colors.black,
+      leading: IconButton(
+        onPressed: () {
+          client.auth.signOut();
+          Navigator.of(context).pushNamed('/');
+        },
+        icon: const Icon(Icons.logout),
+        iconSize: 35,
+        color: Colors.black,
+      ),
       title: Text(
         barTitle,
         style: const TextStyle(