added docs for added attributes for dyson fan (home-assistant#5938)

Author: soraxas

source/_components/fan.dyson.markdown

@@ -22,3 +22,12 @@ You have first to setup the [Dyson component](/components/dyson/)
 
 - Pure Cool link (desk and tower)
 - Pure Hot+cool link (but heating is not yet supported)
+
+### {% linkable_title Attributes %}
+
+The are several attributes that can be useful for automations and templates.
+
+| Attribute | Description |
+| --------- | ----------- |
+| `is_night_mode` | A boolean that indicates if the night mode of the fan device is on.
+| `is_auto_mode` | A boolean that indicates if the auto mode of the fan device is on.