Implement OpenCV Order Receipt Scanner

[guru-murtthy]

Added a complete guide and Python script for capturing and processing order receipts using OpenCV and QR codes.

Pull Request Template

Summary

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Fixes # (issue)

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• New feature (non-breaking change which adds functionality)
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Checklist

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• I have updated the documentation accordingly
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PR Checklist

• Tests added/updated
• Documentation updated
• Changes follow coding standards
• Commit messages are clear

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