* Update README.md
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* Create barcode_validator.py
Barcode/EAN validator
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* Update barcode_validator.py
Included docstring and updated variables to snake_case
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* Update barcode_validator.py
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>
