[docs] Add README for glob directory

glob/README.md

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+# ComfyUI-Manager: Core Backend (glob)
+
+This directory contains the Python backend modules that power ComfyUI-Manager, handling the core functionality of node management, downloading, security, and server operations.
+
+## Core Modules
+
+- **manager_core.py**: The central implementation of management functions, handling configuration, installation, updates, and node management.
+- **manager_server.py**: Implements server functionality and API endpoints for the web interface to interact with the backend.
+- **manager_downloader.py**: Handles downloading operations for models, extensions, and other resources.
+- **manager_util.py**: Provides utility functions used throughout the system.
+
+## Specialized Modules
+
+- **cm_global.py**: Maintains global variables and state management across the system.
+- **cnr_utils.py**: Helper utilities for interacting with the custom node registry (CNR).
+- **git_utils.py**: Git-specific utilities for repository operations.
+- **node_package.py**: Handles the packaging and installation of node extensions.
+- **security_check.py**: Implements the multi-level security system for installation safety.
+- **share_3rdparty.py**: Manages integration with third-party sharing platforms.
+
+## Architecture
+
+The backend follows a modular design pattern with clear separation of concerns:
+
+1. **Core Layer**: Manager modules provide the primary API and business logic
+2. **Utility Layer**: Helper modules provide specialized functionality
+3. **Integration Layer**: Modules that connect to external systems
+
+## Security Model
+
+The system implements a comprehensive security framework with multiple levels:
+
+- **Block**: Highest security - blocks most remote operations
+- **High**: Allows only specific trusted operations
+- **Middle**: Standard security for most users
+- **Normal-**: More permissive for advanced users
+- **Weak**: Lowest security for development environments
+
+## Implementation Details
+
+- The backend is designed to work seamlessly with ComfyUI
+- Asynchronous task queuing is implemented for background operations
+- The system supports multiple installation modes
+- Error handling and risk assessment are integrated throughout the codebase
+
+## API Integration
+
+The backend exposes a REST API via `manager_server.py` that enables:
+- Custom node management (install, update, disable, remove)
+- Model downloading and organization
+- System configuration
+- Snapshot management
+- Workflow component handling