Add Sytadin sensor docs (#3819)

source/_components/sensor.sytadin.markdown

@@ -0,0 +1,35 @@
+---
+layout: page
+title: "Sytadin Sensor"
+description: "Instructions how to integrate Sytadin sensors into Home Assistant."
+date: 2017-10-05 14:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: sytadin.png
+ha_release: 0.57
+ha_category: Sensor
+ha_iot_class: "Clound Polling"
+---
+
+The `sytadin` sensor platform allows you to monitor traffic details from [Sytadin](http://www.sytadin.fr).
+
+To add Sytadin to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: sytadin
+```
+
+Configuration variables:
+
+- **name** (*Optional*): Additional name for the sensors. Default to platform name.
+- **monitored_conditions** array (*Optional*): Conditions to display in the frontend. Defaults to `traffic_jam`.
+  - **traffic_jam**: A human-readable text summary.
+  - **mean_velocity**: The current temperature.
+  - **congestion**: The wind speed.
+
+
+The data is coming from the [Direction des routes Île-de-France (DiRIF)](http://www.sytadin.fr).