Added Xbox Live component docs (#851)

* Added Xbox Live component docs

* Bumped version number

source/_components/sensor.xbox_live.markdown

@@ -0,0 +1,39 @@
+---
+layout: page
+title: "Xbox Live"
+description: "Instructions on how to set up Xbox Live sensors in Home Assistant."
+date: 2016-08-28 02:45
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: xbox-live.png
+ha_category: Social
+ha_iot_class: "Cloud Polling"
+ha_release: 0.28
+---
+
+The Xbox Live component is able to track [Xbox](http://xbox.com/) profiles.
+
+To use this sensor you need a free API key from [XboxAPI.com](http://xboxapi.com). 
+Please also make sure to connect your Xbox account on that site.
+
+The configuration requires you to specify XUIDs which are the unique identifiers for profiles.
+These can be determined on [XboxAPI.com](http://xboxapi.com) by either looking at your own profile page or using their interactive documentation to search for gamertags.
+
+To use the Xbox Live sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: xbox_live
+  api_key: YOUR_API_KEY
+  xuid:
+    - account1
+    - account2
+```
+
+Configuration variables:
+
+- **api_key** (*Required*): Your API key from [XboxAPI.com](http://xboxapi.com).
+- **xuid** (*Required*): Array of profile XUIDs to be tracked.