Initial commit: Project documentation and git setup

lifetimer/lib/core/routing/app_router.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+import '../../features/auth/presentation/auth_gate.dart';
+import '../../features/onboarding/presentation/onboarding_intro_screen.dart';
+import '../../features/countdown/presentation/home_countdown_screen.dart';
+import '../../features/goals/presentation/goals_list_screen.dart';
+import '../../features/social/presentation/social_feed_screen.dart';
+import '../../features/profile/presentation/profile_screen.dart';
+import '../../features/settings/presentation/settings_home_screen.dart';
+
+final appRouterProvider = Provider<GoRouter>((ref) {
+  return GoRouter(
+    initialLocation: '/',
+    routes: [
+      GoRoute(
+        path: '/',
+        builder: (context, state) => const AuthGate(),
+      ),
+      GoRoute(
+        path: '/onboarding',
+        builder: (context, state) => const OnboardingIntroScreen(),
+      ),
+      GoRoute(
+        path: '/home',
+        builder: (context, state) => const HomeCountdownScreen(),
+      ),
+      GoRoute(
+        path: '/goals',
+        builder: (context, state) => const GoalsListScreen(),
+      ),
+      GoRoute(
+        path: '/social',
+        builder: (context, state) => const SocialFeedScreen(),
+      ),
+      GoRoute(
+        path: '/profile',
+        builder: (context, state) => const ProfileScreen(),
+      ),
+      GoRoute(
+        path: '/settings',
+        builder: (context, state) => const SettingsHomeScreen(),
+      ),
+    ],
+    errorBuilder: (context, state) => Scaffold(
+      body: Center(
+        child: Text('Error: ${state.error}'),
+      ),
+    ),
+  );
+});