docs for linode (#3687)

* docs for linode

* Update 'ha_release'

* Fix 'ha_release'

source/_components/binary_sensor.linode.markdown

@@ -0,0 +1,30 @@
+---
+layout: page
+title: "Linode Binary Sensor"
+description: "Instructions on how to set up Linode binary sensors within Home Assistant."
+date: 2017-10-20 08:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: System Monitor
+logo: linode.png
+ha_release: 0.57
+ha_iot_class: "Local Polling"
+---
+
+The `linode` binary sensor platform allows you to monitor your Linode nodes.
+
+Add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+binary_sensor:
+  - platform: linode
+    nodes:
+      - 'myvpsname'
+```
+
+Configuration variables:
+
+- **nodes** (*Required*): List of VPSs you want to control.