added CSG toolkit

addons/csg_toolkit/SETTINGS.md

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+# CSG Toolkit Settings
+
+The CSG Toolkit now uses Godot's built-in **ProjectSettings** system instead of a custom configuration file.
+
+## Accessing Settings
+
+Settings can be accessed in two ways:
+
+1. **Through the CSG Toolkit config window** (recommended for users)
+   - Click the config button in the CSG Toolkit sidebar
+   - Modify settings using the UI
+   - Click "Save" to persist changes
+
+2. **Directly in Project Settings** (for advanced users)
+   - Go to Project → Project Settings
+   - Navigate to the "Addons" section
+   - Look for `addons/csg_toolkit/*` settings
+
+## Available Settings
+
+| Setting | Type | Default | Description |
+|---------|------|---------|-------------|
+| `addons/csg_toolkit/default_behavior` | Enum | Sibling | Default insertion behavior (Sibling or Child) |
+| `addons/csg_toolkit/action_key` | Key | Shift | Primary action key for shortcuts |
+| `addons/csg_toolkit/secondary_action_key` | Key | Alt | Secondary action key for behavior inversion |
+| `addons/csg_toolkit/auto_hide` | Boolean | true | Auto-hide sidebar when no CSG nodes selected |
+
+## Migration from Old Config
+
+If you were using an older version with `csg_toolkit_config.cfg`:
+- The old config file is no longer used
+- Settings are now stored in `project.godot`
+- Settings will be initialized with defaults on first run
+- You'll need to reconfigure your preferences if migrating
+
+## Advantages of ProjectSettings
+
+- Settings are version-controlled with your project
+- Visible and editable in Project Settings editor
+- Better integration with Godot's editor
+- No separate config file to manage
+- Settings persist per-project automatically