Add YOLOv8 LibTorch C++ inference example (#7090)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

examples/YOLOv8-LibTorch-CPP-Inference/README.md

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+# YOLOv8 LibTorch Inference C++
+
+This example demonstrates how to perform inference using YOLOv8 models in C++ with LibTorch API.
+
+## Dependencies
+
+| Dependency   | Version  |
+| ------------ | -------- |
+| OpenCV       | >=4.0.0  |
+| C++ Standard | >=17     |
+| Cmake        | >=3.18   |
+| Libtorch     | >=1.12.1 |
+
+## Usage
+
+```bash
+git clone ultralytics
+cd ultralytics
+pip install .
+cd examples/YOLOv8-LibTorch-CPP-Inference
+
+mkdir build
+cd build
+cmake ..
+make
+./yolov8_libtorch_inference
+```
+
+## Exporting YOLOv8
+
+To export YOLOv8 models:
+
+```commandline
+yolo export model=yolov8s.pt imgsz=640 format=torchscript
+```