Adds docs for Tile (#3938)

* Adds docs for Tile

* Collaborator-requested changes

source/_components/device_tracker.tile.markdown

@@ -0,0 +1,46 @@
+---
+layout: page
+title: "Tile"
+description: "Instructions how to use Tile to track devices in Home Assistant."
+date: 2017-11-08 20:40:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: tile.png
+ha_release: 0.58
+ha_category: Presence Detection
+ha_iot_class: "Cloud Polling"
+---
+
+The `tile` platform allows Home Assistant to utilize [Tile® Bluetooth trackers](https://www.thetileapp.com).
+The official Tile mobile app handles the actual tracking of Tile devices using
+the mobile device's Bluetooh and GPS.
+
+To integrate Tile into Home Assistant, add the following section to your
+`configuration.yaml` file:
+
+```yaml
+device_tracker:
+  - platform: tile
+    username: email@address.com
+    password: MY_PASSWORD_123
+    monitored_variables:
+      - TILE
+      - PHONE
+```
+
+{% configuration %}
+  username:
+    description: the email address for the Tile account
+    required: true
+    type: string
+  password:
+    description: the password for the Tile account
+    required: true
+    type: string
+  monitored_variables:
+    description: the Tile types to monitor; valid values are `TILE` and `PHONE` (default is for all types to be included)
+    required: false
+    type: list
+{% endconfiguration %}