Added scanning barcodes with a camera

quagga2/quagga2-1.12.1/docs/how-to-guides/index.md

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+# How-To Guides
+
+Task-oriented guides for solving specific problems with Quagga2. These assume you have basic familiarity with the library and focus on getting things done.
+
+## Configuration & Setup
+
+### [Configure Barcode Readers](configure-readers.md)
+
+Select which barcode formats to scan (EAN, CODE 128, UPC, etc.) and understand the trade-offs.
+
+### [Use Debug Flags](use-debug-flags.md) 🆕
+
+Enable diagnostic output to troubleshoot issues with localization, decoding, or camera setup.
+
+## Performance & Quality
+
+### [Optimize Performance](optimize-performance.md)
+
+Improve scanning speed and reduce CPU usage through configuration tuning.
+
+### [Handle Difficult Barcodes](handle-difficult-barcodes.md)
+
+Techniques for decoding barcodes with poor lighting, damage, rotation, or small size.
+
+## Advanced Features
+
+### [Create External Readers](external-readers.md)
+
+Build custom barcode decoder plugins to support additional formats.
+
+## Camera & Input
+
+### [Select Specific Camera](select-camera.md) *(Coming Soon)*
+
+Choose between front/back cameras on mobile devices or select from multiple USB cameras.
+
+### [Adjust Camera Settings](camera-settings.md) *(Coming Soon)*
+
+Control focus, zoom, flash/torch, and other camera parameters.
+
+## Drawing & Visualization
+
+### [Working with Box Coordinates](working-with-coordinates.md) 🆕
+
+Understand how `box`, `boxes`, and `line` coordinates relate to processed vs. original image dimensions, and how to properly scale coordinates for overlay rendering on video elements.
+
+## Tips & Best Practices
+
+### [Tips and Tricks](tips-and-tricks.md)
+
+Practical advice for getting the best results with Quagga2, including camera setup, user experience, and handling results.
+
+## Integration
+
+### [Handle Multiple Barcodes](multiple-barcodes.md) *(Coming Soon)*
+
+Detect and decode several barcodes in a single frame simultaneously.
+
+### [Scan in Background](background-scanning.md) *(Coming Soon)*
+
+Continue scanning while users interact with other UI elements.
+
+## Differences from Tutorials
+
+**Tutorials** are for learning - they're comprehensive, beginner-friendly, and explain *why* you're doing each step.
+
+**How-To Guides** are for doing - they're focused, assume knowledge, and show *how* to accomplish specific goals.
+
+If you're new to Quagga2, start with [Tutorials](../tutorials/) instead.
+
+## Contributing
+
+Have a useful technique or solution to share? We welcome contributions! See the [Contributing Guide](../contributing.md).
+
+---
+
+[← Back to Documentation Home](../index.md)