docs: Add GUI Configuration Tool documentation

- Added Tools Included table
- New section documenting portal_config_gui.py features
- Speed control and effect configuration details

README.md

@@ -11,6 +11,38 @@ Designed to integrate with the [Moonlight Drive-In](https://gitea.hideawaygaming
 - **Thread-safe** - Background polling thread with proper locking
 - **Character database** - Built-in lookup for 80+ characters and vehicles
 - **TEA encryption** - Full encryption/decryption support for character IDs
+- **GUI Configuration Tool** - Visual editor for tag themes and video mappings
+
+## Tools Included
+
+| Tool | Description |
+|------|-------------|
+| `lego_dimensions_reader.py` | Core reader module and standalone test |
+| `dimensions_cli_client.py` | CLI client with LED themes and video integration |
+| `portal_config_gui.py` | GUI for configuring tags and themes |
+| `moonlight_integration.py` | Example Moonlight Drive-In integration |
+
+## GUI Configuration Tool
+
+The `portal_config_gui.py` provides a visual interface for:
+
+- **Tag Management** - View, search, and edit all configured tags
+- **Theme Editor** - Set colors with RGB sliders or color picker
+- **Effect Selection** - Choose Solid, Flash, or Pulse effects
+- **Speed Control** - Adjust effect speed from 0.2x (fast) to 3.0x (slow)
+- **Live Preview** - Test colors and effects on connected portal
+- **Tag Detection** - Detect new tags and add them to config
+- **Video Assignment** - Map video files to tags
+
+```bash
+python portal_config_gui.py
+```
+
+![GUI Features]
+- Color picker with RGB sliders and preset colors
+- Effect speed slider for Flash/Pulse animations
+- Real-time portal LED preview
+- JSON config file import/export
 
 ## Hardware Requirements