Added: signup screen, routing logic for login,signup

lib/screens/login.dart

@@ -1,6 +1,10 @@
 import 'package:flutter/material.dart';
+import 'signup.dart';
 
 class LoginScreen extends StatefulWidget {
+  final VoidCallback onSwitchToSignup;
+  const LoginScreen({required this.onSwitchToSignup, super.key});
+
   @override
   State<LoginScreen> createState() => _LoginScreenState();
 }
@@ -25,7 +29,7 @@ class _LoginScreenState extends State<LoginScreen> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text('User Login')),
+      //appBar: AppBar(title: Text('User Login')),
       body: Padding(
         padding: const EdgeInsets.all(24.0),
         child: Form(
@@ -87,6 +91,11 @@ class _LoginScreenState extends State<LoginScreen> {
                       padding: EdgeInsets.symmetric(horizontal: 32, vertical: 12),
                     ),
                   ),
+                  const SizedBox(height: 12),
+                  TextButton(
+                    onPressed: widget.onSwitchToSignup,
+                    child: Text("Don't have an account? Sign up"),
+                  ),
                 ],
               ),
             ),