Add Discourse at https://community.ultralytics.com

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancements to the README for better community engagement with new badges.

📊 Key Changes

• Added a Discord shield badge linking to the Ultralytics Discord server.
• Added a Forums shield badge linking to the Ultralytics community forums.

🎯 Purpose & Impact

• Enhanced Engagement: 🗨️ Users can now easily connect with the Ultralytics community for support and collaboration via Discord and Forums.
• Improved Accessibility: 🔗 Quick access to community resources directly from the project's README.