Add simple Readme(Python, Gradio on Colab)

Author: Kazuhito00

474_Gaze-LLE-DINOv3/demo/README.md

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+# Demo projects
+
+## Gaze-LLE-DINOv3 with ONNX Runtime in Python
+```bash
+# Run with video file
+python demo_deimv2_onnx_wholebody34_with_edges.py -v video.mp4
+
+# Run with webcam
+python demo_deimv2_onnx_wholebody34_with_edges.py -v 0
+
+# Run with image directory
+python demo_deimv2_onnx_wholebody34_with_edges.py -i <images_dir>
+```
+
+## Gaze-LLE-DINOv3 Gradio Demo on Google Colab
+The demo code is available in an external repository.<br>
+Launch the Colaboratory notebook from the link below.
+
+[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/Kazuhito00/PINTO_model_zoo-Gradio-Demo/blob/main/474_Gaze-LLE-DINOv3/gradio_colab_app.ipynb)