Add asset bootstrap script and base64 encoded assets

Author: nbschultz97

.gitignore

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+# Generated binary assets
+app/
+__pycache__/

README.md

@@ -1 +1,16 @@
+# DroneDetectAndroid
 
+This repo hosts Android-side utilities for drone rotor detection.
+Binary assets (TensorFlow Lite model and icons) are stored in base64 to
+keep the repo lean for air-gapped deployments.
+
+## Bootstrap
+
+After cloning, restore the binary assets:
+
+```bash
+python3 scripts/bootstrap_assets.py
+```
+
+This will recreate the `rotor_v1.tflite` model and the required PNG
+drawables under `app/src/main/...`.

USAGE.md

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+# Usage
+
+1. Clone the repository.
+2. Restore binary assets:
+
+   ```bash
+   python3 scripts/bootstrap_assets.py
+   ```
+3. Open the Android project in Android Studio or your preferred build
+   system. The script will have populated `app/src/main/assets` and
+   `app/src/main/res/drawable`.

assets/drone_icon.png.b64

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+iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVR4nGP4z8AAAAMBAQDJ/pLvAAAAAElFTkSuQmCC

assets/radar_icon.png.b64

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+iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVR4nGNgYPgPAAEDAQAIicLsAAAAAElFTkSuQmCC

assets/rotor_v1.tflite.b64

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+cm90b3IgbW9kZWwgcGxhY2Vob2xkZXI=

scripts/bootstrap_assets.py

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+#!/usr/bin/env python3
+"""Decode base64-encoded assets into their binary forms.
+
+Designed for air-gapped setups: keeps repository text-only and restores
+binary assets locally. Currently handles rotor model and PNG icons.
+"""
+import base64
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+ASSET_SRC = ROOT / 'assets'
+MODEL_DST = ROOT / 'app' / 'src' / 'main' / 'assets'
+DRAWABLE_DST = ROOT / 'app' / 'src' / 'main' / 'res' / 'drawable'
+
+
+def decode_file(src: Path, dst: Path) -> None:
+    data = base64.b64decode(src.read_text())
+    dst.parent.mkdir(parents=True, exist_ok=True)
+    dst.write_bytes(data)
+    print(f"decoded {src} -> {dst}")
+
+
+def main() -> None:
+    # Model
+    model_b64 = ASSET_SRC / 'rotor_v1.tflite.b64'
+    if model_b64.exists():
+        decode_file(model_b64, MODEL_DST / 'rotor_v1.tflite')
+    # PNG assets
+    for b64_file in ASSET_SRC.glob('*.png.b64'):
+        out_name = b64_file.name[:-4]  # strip .b64
+        decode_file(b64_file, DRAWABLE_DST / out_name)
+
+
+if __name__ == '__main__':
+    main()