deCONZ cover documentation (#6325)

* deCONZ cover documentation

* Add device type description

source/_components/cover.deconz.markdown

@@ -0,0 +1,26 @@
+---
+layout: page
+title: "deCONZ Covers"
+description: "Instructions on how to integrate Zigbee covers from deCONZ into Home Assistant."
+date: 2018-09-20 23:32
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: deconz.jpeg
+ha_category: Cover
+ha_release: "0.79"
+ha_iot_class: "Local Push"
+---
+
+See the [deCONZ main component](/components/deconz/) for configuration instructions.
+
+Covers are devices like ventilation dampers.
+
+Note that devices in the cover platform identify as lights, so there is a manually curated list that defines which "lights" are covers.
+
+The `entity_id` name will be `cover.device_name`, where `device_name` is defined in deCONZ.
+
+#### {% linkable_title Verified supported covers %}
+
+- Keen vents

source/_components/cover.markdown

@@ -15,7 +15,7 @@ The display style of each entity can be modified in the [customize section](/get
  
 | Attribute | Default | Description |
 | --------- | ------- | ----------- |
-| `device_class` | | `none` Generic cover device<br>`window` Window controller<br>`garage` Garage door controller
+| `device_class` | | `none` Generic cover device<br>`damper` Ventilation damper controller<br>`garage` Garage door controller<br>`window` Window controller
 | `assumed_state` | `false` | If set to `true`, cover buttons will always be enabled
 
 ## {% linkable_title Services %}