添加状态分类和液面分割

ultralytics_yolov8-main/examples/YOLOv8-OpenCV-ONNX-Python/README.md

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+# YOLOv8 - OpenCV
+
+Implementation YOLOv8 on OpenCV using ONNX Format.
+
+Just simply clone and run
+
+```bash
+pip install -r requirements.txt
+python main.py --model yolov8n.onnx --img image.jpg
+```
+
+If you start from scratch:
+
+```bash
+pip install ultralytics
+yolo export model=yolov8n.pt imgsz=640 format=onnx opset=12
+```
+
+_\*Make sure to include "opset=12"_