feat: Add documentation, logging, tests and error handling improvements #3
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This PR introduces several improvements for maintainability and contributor experience:
Added comprehensive docstrings to all functions and classes (Google/NumPy style)
Implemented structured logging using Python's logging module
Improved error handling with try-except blocks and meaningful messages
Added unit tests for helper functions and core logic (see test_bench_pandas.py and test_common.py)
Enhanced README.md with quick start, installation, usage, and contributing sections
Added CONTRIBUTING.md for new contributors
Updated pyproject.toml with development dependencies and test configuration