docs: add README and GEMINI.md

GEMINI.md

@@ -0,0 +1,41 @@
+# GEMINI.md
+
+## App: phone_login
+
+This document describes the "phone_login" Flutter application, its purpose, implementation details, and file layout.
+
+## Purpose
+
+The "phone_login" app is a simple Flutter application that demonstrates a phone number-based authentication flow. It includes screens for entering a phone number, verifying an SMS code, and displaying different content based on the user's authentication status. The app also features a basic home screen and a profile screen.
+
+## Implementation Details
+
+The application is built using the Flutter framework and follows a layered architecture to separate concerns.
+
+### Key Components:
+
+*   **Authentication:** The authentication flow is designed to be handled by Firebase Authentication, but it is currently mocked for demonstration purposes. The `AuthState` class manages the user's authentication state.
+*   **Navigation:** `go_router` is used for declarative routing and navigation. It includes a redirect mechanism to handle authentication-aware routes.
+*   **State Management:** `provider` is used for state management, with `ChangeNotifierProvider` making the `AuthState` available throughout the app.
+*   **UI:** The user interface is built with Flutter's Material Design widgets. The screens are designed to be simple and intuitive.
+
+### File Layout:
+
+```
+lib/
+├── main.dart              # App entry point
+├── app.dart               # MaterialApp setup, theme, and routing
+├── auth/                  # Authentication-related screens and logic
+│   ├── auth_state.dart    # Manages authentication state
+│   ├── phone_input_screen.dart
+│   └── sms_verification_screen.dart
+├── home/                  # Home screen
+│   └── home_screen.dart
+├── profile/               # User profile screen
+│   └── profile_screen.dart
+├── services/              # Backend services (e.g., Firebase)
+├── shared/                # Common widgets, utilities, models
+│   ├── models/
+│   └── widgets/
+└── theme/                 # Theming and styling
+```

README.md

@@ -1 +1,16 @@
-# phone_login
+# Phone Login
+
+A new Flutter project for phone login.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+
+For help getting started with Flutter development, view the
+[online documentation](https://docs.flutter.dev/), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.