Add docs for all files in /misc

docs/misc/README.md

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+# Misc Documentation
+
+This directory contains miscellaneous documentation for various components of the Proxmox Community Scripts project.
+
+## Documentation Categories
+
+### 📁 [build.func/](./build.func/)
+Comprehensive documentation for the `build.func` script - the core orchestration script for Proxmox LXC container creation.
+
+**Contents:**
+- Visual execution flowcharts
+- Complete environment variables reference
+- Function documentation
+- Detailed execution flows
+- System architecture guide
+- Practical usage examples
+
+### 📁 [core.func/](./core.func/)
+Fundamental utility functions and system checks that form the foundation for all other scripts.
+
+**Contents:**
+- Visual execution flowcharts
+- Complete function reference
+- Practical usage examples
+- Integration with other components
+
+### 📁 [error_handler.func/](./error_handler.func/)
+Comprehensive error handling and signal management for Proxmox Community Scripts.
+
+**Contents:**
+- Visual execution flowcharts
+- Complete function reference
+- Practical usage examples
+- Integration with other components
+
+## Other Documentation
+
+Additional miscellaneous documentation may be added here as the project grows.
+
+---
+
+*This directory contains specialized documentation for specific components of the Proxmox Community Scripts project.*