Add DOTA8 OBB example dataset

[sergiuwaxmann]

This PR adds DOTA8 OBB example dataset to example_datasets.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

New DOTA8 dataset added for testing and debugging Ultralytics object detection models.

📊 Key Changes

• Added new DOTA8 dataset archive file dota8.zip.
• Included GNU Affero General Public License (AGPL) file within dataset directory.
• Provided an extensive README for the DOTA8 dataset explaining usage and resources.
• Created dataset configuration file dota8.yaml to define training and validation splits.
• Added sample images and label files for training and validation.

🎯 Purpose & Impact

• 🎯 Purpose: The DOTA8 dataset allows developers and researchers to quickly test and debug Ultralytics detection models with a small set of versatile images.
• 🚀 Impact: Simplifies the model development process, providing a "sandbox" environment for testing before scaling to larger datasets. This helps iterate quicker and potentially improves the qualitity of models.
• 🌍 Accessibility: Accompanied by comprehensive documentation and licensing, ensuring users understand how to apply the dataset and under what terms.

[kalenmike]

LGTM