Add file headers

[glenn-jocher]

🛠️ PR Summary

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🌟 Summary

Updated the template package initialization and add_numbers function documentation.

📊 Key Changes

• Added spacing in __init__.py for better readability.
• Included additional blank lines in module1.py, likely for code clarity.
• Inserted blank lines in test_module1.py to maintain consistent code formatting.

🎯 Purpose & Impact

• These changes might not introduce new features but aim to improve the codebase cleanliness and readability.
• Readability enhancements can lead to easier maintenance and a better experience for future contributors.
• There is no direct impact on users, as these modifications seem to be purely cosmetic. 🌟