Update README with example image and usage instructions

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README.md

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 # Set Solver
 
-Vision-based solver for the [Set card game](https://www.setgame.com/).
+Real-time vision-based solver for the [Set card game](https://www.setgame.com/).
 
-Point your camera at Set cards → Get all valid Sets highlighted in real time.
+Point your phone camera at Set cards and get all valid Sets highlighted instantly.
+
+![Example detection](./example-detection.png)
+
+## How to Use
+
+1. Open this Space on your phone or desktop browser
+2. Grant camera access (rear camera preferred)
+3. Press **Start** to begin scanning
+4. The solver announces "Set!" and highlights found Sets
+5. Use the arrows to cycle through multiple Sets
+6. Press **Restart** to scan again
+
+## Under the Hood
+
+- **YOLOv11n** detector (99.5% mAP50) locates cards on the board
+- **MobileNetV3** classifier (100% accuracy) reads each card's 4 attributes (shape, color, number, fill)
+- Combinatorial solver finds all valid Sets in the detected cards