Document the buienradar camera component (#10106)

* Document the buienradar camera component

Buienradar camera had been added in 0.95 but documentation was not
added.

* ✏️ Tweak

source/_components/buienradar.markdown

@@ -3,6 +3,7 @@ title: "Buienradar"
 description: "Instructions on how to integrate buienradar.nl weather within Home Assistant."
 logo: buienradar.png
 ha_category:
+  - Camera
   - Weather
 ha_release: 0.47
 ha_iot_class: Cloud Polling
@@ -14,6 +15,11 @@ The `buienradar` platform uses [buienradar.nl](http://buienradar.nl/) as a sourc
 
 The relevant weather station used will be automatically selected based on the location specified in the Home Assistant configuration (or in the Buienradar weather/sensor component).  A map of all available weather stations can be found [here](https://www.google.com/maps/d/embed?mid=1NivHkTGQUOs0dwQTnTMZi8Uatj0).
 
+Besides the weather platform, there is currently support for the following additional device types:
+
+- [Camera](#camera): Radar map
+- [Sensor](/components/sensor.buienradar/): More customizable
+
 ## Configuration
 
 To add the Buienradar weather to your installation, add the following to your `configuration.yaml` file:
@@ -59,6 +65,7 @@ weather:
     forecast: true
 ```
 
+
 <div class='note'>
 
 This platform is an alternative to the [`buienradar`](/components/sensor.buienradar/) sensor.
@@ -66,5 +73,47 @@ The weather platform is easier to configure but less customizable.
 
 </div>
 
+## Camera
+
+The `buienradar` camera platform uses [buienradar.nl](http://buienradar.nl/) as a source for the last rain radar map. The overview image of the whole of the Netherlands is loaded and shown as a camera in Home Assistant.
+
+Internally this component uses the radar map image as [documented](https://www.buienradar.nl/overbuienradar/gratis-weerdata) on buienradar.nl.
+The downloaded image is cached to prevent Home Assistant from making a new request to buienradar.nl multiple times a minute when Home Assistant checks for new stills from the camera.
+
+To add `buienradar` camera to Home Assistant, add the following section to your
+`configuration.yaml` file:
+```yaml
+# Example configuration.yaml entry
+camera:
+  - platform: buienradar
+```
+
+{% configuration %}
+name:
+  description: You can (optionally) specify the name of the camera. The name
+    will be shown in the user interface below the radar image.
+  required: false
+  type: string
+dimension:
+  description: Size of the image to be loaded from buienradar.nl
+    (120 to 700 pixels)
+  required: false
+  default: 512
+  type: integer
+delta:
+  description: Time interval in seconds between image updates
+  required: false
+  default: 600
+  type: integer
+{% endconfiguration %}
+
+### The `name` Variable
+
+If you specify a name, the camera will get this name as its label. A slugified
+version of the name will be used as the name of the entity.
+
+With the default of "Buienradar loop" the entity name becomes
+`camera.buienradar_loop`.
+
 [Usage statement:](https://www.buienradar.nl/overbuienradar/gratis-weerdata)
 > Buienradar makes free weather data available for use by individuals and businesses (website/intranet). The use of the weather data is allowed for **non-commercial purposes**. Please refer to the full usage statement linked above to confirm your use or to request permission.