Update README.md

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancing the Ultralytics GitHub profile README with a splash of enthusiasm and global connectivity.

📊 Key Changes

• Added a rocket emoji 🚀 to emphasize the excitement around cutting-edge AI solutions.
• Modified the welcome message to explicitly include the global community 🌍, underlining their inclusive approach.
• Appended emojis 💡🌟 at the end of the call to action, encouraging engagement with a sense of inspiration and excellence.

🎯 Purpose & Impact

• The use of emojis adds a vibrant, friendly, and dynamic tone to the README, which can make the content more approachable and engaging.
• Acknowledging the 'global community' could foster a more inclusive atmosphere and encourage international collaboration.
• The changes aim to boost community involvement, potentially leading to more contributions, feedback, and growth of Ultralytics' AI platforms.