docs: update readme

README.md

@@ -40,16 +40,20 @@ import { MultilingualWidget } from 'volto-multilingual-widget'
 const CustomWidget = ({ id, value, placeholder, onChange }) => (
   <input type="number" id={id} placeholder={placeholder} value={value} onChange={onChange} />
 )
+const defaultValue = '' // could be any;
 
 export const widgets = {
   ...defaultWidgets,
   id: {
     ...defaultWidgets.id,
-    cookie_consent_configuration: MultilingualWidget(CustomWidget),
+    news_type: MultilingualWidget(CustomWidget),
+    cookie_consent_configuration: MultilingualWidget(CustomWidget, defaultValue),
   },
 }
 ```
 
+If needed, you can pass a second argument for the default value for the custom widget.
+
 Multilingual widget is agnostic about value types and handles the multilingual aspect more than data specific ones.
 So you could handle boolean or numeric values, which will be saved in a JSON as described below.