Add comprehensive documentation and testing framework for ONVIF library

docs/README.md

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+# Additional Documentation
+
+This directory contains supplementary documentation for the onvif-go project.
+
+## Contents
+
+- **ARCHITECTURE.md** - System architecture and design decisions
+- **CAMERA_TESTS.md** - Camera testing framework documentation
+- **IMPLEMENTATION_SUMMARY.md** - Implementation details and notes
+- **PROJECT_SUMMARY.md** - Project overview and planning
+- **TEST_QUICKSTART.md** - Testing quickstart guide
+- **XML_DEBUGGING_SOLUTION.md** - XML debugging tips and solutions
+
+## Main Documentation
+
+For primary documentation, see the root directory:
+
+- [README.md](../README.md) - Main project documentation
+- [QUICKSTART.md](../QUICKSTART.md) - Getting started guide
+- [BUILDING.md](../BUILDING.md) - Build and release instructions
+- [CONTRIBUTING.md](../CONTRIBUTING.md) - Contribution guidelines
+- [CHANGELOG.md](../CHANGELOG.md) - Version history and changes