chore: included crossplatform to readme

Author: jkalasas

README.md

@@ -5,7 +5,8 @@ A Skincare product analysis app, designed to help users identify product suitabi
 ## Features
 
 - 🔐 **Google Authentication**: Secure sign-in with your Google account
-- 🤖 **AI-Powered Analysis**: Get intelligent product assessments using Google Gemini
+- 🤖 **AI-Powered Analysis**: Get intelligent product assessments using Firebase AI (Gemini Flash)
+- 🧴 **Routine Companion**: Check if your skincare products work well together
 - 📸 **Image Upload**: Analyze products by uploading images
 - 📝 **Product Management**: Save and manage your product collection
 - 📊 **Product Comparison**: Compare multiple products side-by-side
@@ -19,7 +20,8 @@ A Skincare product analysis app, designed to help users identify product suitabi
 - **Language**: TypeScript
 - **Styling**: Tailwind CSS
 - **UI Components**: shadcn-svelte
-- **AI**: Google Gemini
+- **AI**: Firebase AI (Gemini Flash)
+- **Cross-Platform**: Tauri 2.0 (Desktop: Windows, macOS, Linux; Mobile: Android, iOS)
 - **Authentication**: Firebase Authentication
 - **Database**: Cloud Firestore
 - **Bundler**: Vite
@@ -30,6 +32,9 @@ A Skincare product analysis app, designed to help users identify product suitabi
 
 - Node.js 18+ or Bun
 - A Firebase project (see [Firebase Setup Guide](./FIREBASE_SETUP.md))
+- For desktop development: Rust toolchain (rustup)
+- For Android development: Android SDK, Java JDK
+- For iOS development: Xcode (macOS only)
 
 ### Installation
 
@@ -62,7 +67,21 @@ A Skincare product analysis app, designed to help users identify product suitabi
 
 5. Open [http://localhost:5173](http://localhost:5173) in your browser
 
-## Building for Production
+## Running with Tauri
+
+```bash
+# Desktop development
+npm run tauri:dev
+# or
+bun run tauri:dev
+
+# Build for desktop
+npm run tauri:build
+# or
+bun run tauri:build
+```
+
+## Building for Production (Web)
 
 ```bash
 npm run build
@@ -77,37 +96,44 @@ This will create a static build in the `build` directory.
 ```
 src/
 ├── lib/
-│   ├── ai/              # AI integration (Gemini)
+│   ├── ai/              # AI integration (Firebase AI)
 │   ├── components/      # Reusable components
 │   │   ├── custom/      # Custom app components
 │   │   └── ui/          # shadcn-svelte components
 │   ├── db/              # Database modules (Firestore)
+│   ├── platform.ts      # Platform detection utilities (Tauri/Web)
 │   ├── stores/          # Svelte stores
 │   └── types/           # TypeScript type definitions
 ├── routes/              # SvelteKit routes/pages
 └── app.css              # Global styles
+src-tauri/               # Tauri 2.0 configuration and Rust code
 ```
 
 ## Environment Variables
 
 Create a `.env` file with the following variables:
 
 ```env
-PUBLIC_FIREBASE_API_KEY=your-api-key
-PUBLIC_FIREBASE_AUTH_DOMAIN=your-project.firebaseapp.com
-PUBLIC_FIREBASE_PROJECT_ID=your-project-id
-PUBLIC_FIREBASE_STORAGE_BUCKET=your-project.appspot.com
-PUBLIC_FIREBASE_MESSAGING_SENDER_ID=your-sender-id
-PUBLIC_FIREBASE_APP_ID=your-app-id
+PUBLIC_FIREBASE_API_KEY=
+PUBLIC_FIREBASE_AUTH_DOMAIN=
+PUBLIC_FIREBASE_PROJECT_ID=
+PUBLIC_FIREBASE_STORAGE_BUCKET=
+PUBLIC_FIREBASE_MESSAGING_SENDER_ID=
+PUBLIC_FIREBASE_APP_ID=
+PUBLIC_GOOGLE_CLIENT_ID=
 PUBLIC_MAX_MULTI_COUNT=5
+
+# Android Signing (for release APK builds)
+# Run: source .env && bun run tauri android build --apk --release
+ANDROID_KEYSTORE_PASSWORD=
+ANDROID_KEY_PASSWORD=
+# Optional (defaults shown):
+# ANDROID_KEYSTORE_PATH=src-tauri/skeen-release.keystore
+# ANDROID_KEY_ALIAS=skeen
 ```
 
 See [Firebase Setup Guide](./FIREBASE_SETUP.md) for detailed instructions.
 
 ## Contributing
 
 Contributions are welcome! Please feel free to submit a Pull Request.
-
-## License
-
-This project is licensed under the MIT License.