Add initial Sky Hub docs (#1895)

source/_components/device_tracker.sky_hub.markdown

@@ -0,0 +1,31 @@
+---
+layout: page
+title: "Sky Hub"
+description: "Instructions how to integrate Sky Hub routers into Home Assistant."
+date: 2017-01-28 09:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: sky.png
+ha_category: Presence Detection
+ha_release: 0.37
+---
+
+
+The `sky_hub` platform offers presence detection by looking at connected devices to a [Sky Hub router](http://www.sky.com/shop/broadband-talk/sky-hub/) based router.
+
+To use your Sky Hub device in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  - platform: sky_hub
+```
+
+Configuration variables:
+
+- **host** (*Optional*): The IP address of your router. Defaults to `192.168.1.254`.
+
+See the [device tracker component page](/components/device_tracker/) for instructions how to configure the people to be tracked.
+