docs: add contract_card_position setting to README

Author: jsenecal

README.md

@@ -33,7 +33,30 @@ Example:
 
 ## Configuration
 
-None
+The plugin can be configured via `PLUGINS_CONFIG` in your NetBox configuration file:
+
+```python
+PLUGINS_CONFIG = {
+    'netbox_lifecycle': {
+        'contract_card_position': 'right_page',
+    },
+}
+```
+
+### Available Settings
+
+| Setting | Default | Description |
+|---------|---------|-------------|
+| `contract_card_position` | `right_page` | Position of the Support Contracts card on device detail pages. Options: `left_page`, `right_page`, `full_width_page`. |
+
+### Contract Card Position
+
+When enabled, a Support Contracts card will be displayed on device detail pages showing all contract assignments grouped by status:
+
+- **Active**: Contracts currently in effect
+- **Future**: Contracts with a start date in the future
+- **Unspecified**: Contracts without an end date
+- **Expired**: Contracts that have ended (lazy-loaded for performance)
 
 ## Usage