Update README.md

[glenn-jocher]

copilot:all

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced README.md with badges and improved code snippet formatting in the Ultralytics Docs.

📊 Key Changes

• Added PyPI version badge and downloads badge to the installation section.
• Indented code snippets for better readability.

🎯 Purpose & Impact

• 🚀 Purpose: To provide users with quick access to the latest package version and download stats, and to improve the clarity of installation instructions.
• 💻 Impact: Users can now easily view the popularity and the latest version of the package, potentially leading to increased trust and usage. Better-formatted documentation enhances the overall user experience for developers setting up the Ultralytics package.