Add binary command sensor docs

source/_components/binary_sensor.command.markdown

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+---
+layout: component
+title: "Command binary sensor"
+description: "Instructions how to integrate Command binary sensors within Home Assistant."
+date: 2016-01-13 12:15
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Binary Sensor
+---
+
+
+The `command` binary sensor platform issues specific commands to get data.
+
+To use your Command binary sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+binary_sensor:
+  platform: command_sensor
+  command: cat /proc/sys/net/ipv4/ip_forward
+  name: 'IP4 forwarding'
+  payload_on: "1"
+  payload_of: "0"
+  value_template: '{% raw %}{{ value.x }}{% endraw %}'
+```
+
+Configuration variables:
+
+- **command** (*Required*): The action to take to get the value.
+- **name** (*Optional*): Let you overwrite the the name of the device. By default *name* from the device is used.
+- **payload_on** (*Optional*): The payload that represents enabled state. Default is "ON".
+- **payload_off** (*Optional*): The payload that represents disabled state. Default is "OFF".
+- **value_template** (*Optional*): Defines a [template](/getting-started/templating/) to extract a value from the payload.
+
+## {% linkable_title Examples %}
+
+In this section you find some real life examples of how to use this sensor.
+
+### {% linkable_title SickRage %}
+
+Check the state of an [SickRage](https://github.com/sickragetv/sickrage) instance.
+
+```yaml
+# Example configuration.yaml entry
+binary_sensor:
+  platform: command_sensor
+  command: netstat -na | find "33322" | find /c "LISTENING" > nul && (Echo 1 ) || (Echo 0)
+  name: 'sickragerunning'
+  payload_on: "1"
+  payload_of: "0"
+```
+
+### {% linkable_title Check RasPlex %}
+
+Check if [RasPlex](http://www.rasplex.com/) is `online`.
+
+```yaml
+binary_sensor:
+  platform: command_sensor
+  command: 'ping rasplex.local -c 1 | grep "1 received" | wc -l'
+  name: 'is_rasplex_online'
+  payload_on: 1
+  payload_off: 0
+```
+