feat: example with flutter sdk

flutter/README.md

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+# Supertonic Flutter Example
+
+This example demonstrates how to use Supertonic in a Flutter application using ONNX Runtime.
+
+> **Note:** This project uses the `flutter_onnxruntime` package ([https://pub.dev/packages/flutter_onnxruntime](https://pub.dev/packages/flutter_onnxruntime)). At the moment, only the macOS platform has been tested. Although the flutter_onnxruntime package supports several other platforms, they have not been tested in this project yet and may require additional verification.
+
+
+## 📰 Update News
+
+**2025.11.23** - Added and tested macos support.
+
+## Requirements
+
+- Flutter SDK version ^3.5.0
+
+## Running the Demo
+
+```bash
+flutter clean
+flutter pub get
+flutter run -d macos
+```
+