email auth instead of google

lib/auth_gate.dart

@@ -0,0 +1,55 @@
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import 'package:flutterfire_ui/auth.dart';
+
+import 'home.dart';
+
+class AuthGate extends StatelessWidget {
+  const AuthGate({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return StreamBuilder<User?>(
+      stream: FirebaseAuth.instance.authStateChanges(),
+      builder: (context, snapshot) {
+        if (!snapshot.hasData) {
+          return SignInScreen(
+            providerConfigs: const [
+              EmailProviderConfiguration(),
+            ],
+            headerBuilder: (context, constraints, shrinkOffset) {
+              return Padding(
+                padding: const EdgeInsets.all(20),
+                child: AspectRatio(
+                  aspectRatio: 1,
+                  child: Image.asset(
+                    'assets/ruexpress.png',
+                    height: 60.0,
+                    fit: BoxFit.cover,
+                  ),
+                ),
+              );
+            },
+            subtitleBuilder: (context, action) {
+              return Padding(
+                padding: const EdgeInsets.symmetric(vertical: 8.0),
+                child: action == AuthAction.signIn ? const Text('Welcome to RUSwipeShare, please sign in!') : const Text('Welcome to RUSwipeShare, please sign up!'),
+              );
+            },
+            footerBuilder: (context, action) {
+              return const Padding(
+                padding: EdgeInsets.only(top: 16),
+                child: Text(
+                  'By signing in, you agree to our terms and conditions.',
+                  style: TextStyle(color: Colors.grey),
+                ),
+              );
+            },
+          );
+        }
+
+        return const HomeScreen();
+      },
+    );
+  }
+}