Added TrackR doc.

source/_components/device_tracker.trackr.markdown

@@ -0,0 +1,34 @@
+---
+layout: page
+title: "TrackR"
+description: "Instructions how to use TrackR to track devices in Home Assistant."
+date: 2016-12-22 1000
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: trackr.png
+ha_release: 0.36
+ha_category: Presence Detection
+ha_iot_class: "Cloud Polling"
+---
+
+
+The `trackr` platform allows you to detect presence using [TrackR](https://www.thetrackr.com/) devices. 
+
+The offical TrackR mobile app handles the tracking of the TrackR devices using your phones bluetooth and GPS.
+
+To integrate TrackR in Home Assistant, add the following section to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  platform: trackr
+  username: USERNAME
+  password: PASSWORD
+```
+
+Configuration variables:
+
+- **username** (*Required*): The email address for the TrackR account.
+- **password** (*Required*): The password for your given username.