Add tado docs (#1801)

source/_components/device_tracker.tado.markdown

@@ -0,0 +1,34 @@
+---
+layout: page
+title: "Tado"
+description: "Instructions how to integrate Tado into Home Assistant."
+date: 2015-10-08 12:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: tado.png
+ha_category: Presence Detection
+ha_release: 0.37
+---
+
+The `tado` device tracker is using the [Tado Smart Thermostat](https://www.tado.com/) and it's support for person presence detection based on smartphone location by geofencing.
+
+This tracker uses the Tado API to determine if a mobile device is at home.
+
+To use theTado platform in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry for SNMP version 1
+device_tracker:
+  - platform: tado
+    username: YOUR_USERNAME
+    password: YOUR_PASSWORD
+```
+
+Configuration variables:
+
+- **username** (*Required*): The username for your Tado account.
+- **password** (*Required*): The password for your Tado account.
+
+See the [device tracker component page](/components/device_tracker/) for instructions how to configure the people to be tracked.