Add new platform for the Unitymedia Horizon HD Recorder (#5303)

source/_components/media_player.horizon.markdown

@@ -0,0 +1,45 @@
+---
+layout: page
+title: "Horizon HD Recorder"
+description: "Instructions how to integrate the Unitymedia Horizon HD Recorder into Home Assistant."
+date: 2018-05-02 20:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: unitymedia.png
+ha_category: Media Player
+ha_iot_class: "Local Polling"
+ha_release: 0.72
+---
+
+The `horizon` component allows you to control a [Unitymedia](https://www.unitymedia.de) Horizon HD Recorder from Home Assistant.
+
+To add a Horizon HD Recorder to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+media_player:
+  - platform: horizon
+    host: 192.168.0.127
+```
+
+{% configuration %}
+  host:
+    description: The hostname or address of the device.
+    required: true
+    type: string
+  port:
+    description: The port of the device to connect to.
+    required: false
+    type: int
+  name:
+    description: The name of the device used in the frontend.
+    required: false
+    type: string
+{% endconfiguration %}
+
+
+#### {% linkable_title Preparation of the Horizon HD Recorder %}
+
+The Home Networking ("Heimnetzwerk") service needs to be enabled at the settings menu of the Horizon receiver. Once you have set up the Media Library ("Medienbibliothek"), we can determine whether the device is turned on or off. Without this, the component will fail to start.