Update README.md with Discord badge

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced collaboration and streamlined TensorFlow training in Ultralytics WAVE project.

📊 Key Changes

• Added a Discord badge to the README for better community interaction. 🤝
• Reorganized TensorFlow and Plotly imports in train_tf.py for clarity and structure. 📈
• Enabled eager execution in TensorFlow right at the start, streamlining the setup process. 💡

🎯 Purpose & Impact

• The addition of the Discord badge aims to foster a more engaged and supportive community, enabling users and developers to discuss ideas, issues, and updates more freely. 🌐
• Reorganizing imports and the early activation of eager execution in TensorFlow simplifies the code and potentially improves the ease of understanding and efficiency for new contributors or researchers looking into utilizing machine learning for particle physics detection. 🚀
• These changes could lead to more robust collaboration, quicker onboarding of new contributors, and potentially innovative approaches in the application of deep learning in physics research. 🔍