Improve README

[pderrenger]

This pull request attempts to improve the repo README file with additional context and content.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancements to Flickr image scraper tool for efficient dataset creation 📸💻

📊 Key Changes

• Improved tool description, highlighting its usefulness for YOLO model training.
• Simplified installation and setup instructions with updated commands.
• Clarified API key setup process, with placeholders for easy replacement.
• Streamlined run command with clear output examples.
• Condensed sections like citation, contribution, license, and contact info.
• Removed specific image URLs in output examples to focus on the general process.
• Emphasized the different licensing options for diverse user requirements.

🎯 Purpose & Impact

• Clarity and Usability: Updates have made the process more user-friendly, making it easier for users to start collecting images for YOLO training.
• Accessibility: Clear instructions and examples improve accessibility for users of varying skill levels.
• Adaptability: By focusing on the general use-case rather than specific examples, the PR makes the tool more adaptable to different scenarios.