Add initial aREST page for binary sensor

source/_components/binary_sensor.arest.markdown

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+---
+layout: component
+title: "aREST binary sensor"
+description: "Instructions how to integrate aREST binary sensors within Home Assistant."
+date: 2015-11-20 18:15
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: arest.png
+ha_category: Binary Sensor
+---
+
+
+The arest binary sensor platform allows you to get all data from your devices (like Arduinos with a ethernet/wifi connection, the ESP8266, and the Raspberry Pi) running the [aREST](http://arest.io/) RESTful framework.
+
+To use your aREST binary sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: arest
+  resource: http://IP_ADDRESS
+  name: Office Switch
+  pin: 8
+```
+
+Configuration variables:
+
+- **resource** (*Required*): IP address and schema of the device that is exposing an aREST API, e.g. http://192.168.1.10.
+- **name** (*Optional*): Let you overwrite the the name of the device. By default *name* from the device is used.
+- **pin** (*Required*): Number of the pin to monitor.
+
+Accessing the URL http://IP_ADDRESS/digital/PIN_NUMBER should give you the state of the pin inside a JSON response as `return_value`.
+
+```bash
+$ curl -X GET http://10.100.0.157/digital/9
+{"return_value": 0, "id": "office1", "name": "Office", "connected": true}
+
+```
+
+<p class='note'>
+This sensor is not suitable for fast state changes because there is a high possibility that the change took place between two update cycle. 
+</p>