Adding in docs for Vultr platform and sensors (#3663)

* Added Vultr logo

* Added v1 Vultr hub

* Added init sensor docs for Vultr

* Updated Vultr components to next version

* Updating Vultr components

* Added more details to vultr sensors

* Updated Vultr component docs

* Corrected Vultr name default values, added vultr sensor {} name option

source/_components/binary_sensor.vultr.markdown

@@ -0,0 +1,42 @@
+---
+layout: page
+title: "Vultr Binary Sensor"
+description: "Instructions on how to set up Vultr binary sensors within Home Assistant."
+date: 2017-10-17 21:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: System Monitor
+logo: vultr.png
+ha_release: "0.57"
+ha_iot_class: "Cloud Polling"
+---
+
+The `vultr` binary sensor platform allows you to monitor your [Vultr](https://www.vultr.com/) subscription to see if it is powered on or not.
+
+To use this binary sensor, you first have to set up your [Vultr hub](/components/vultr/).
+
+<p class='note'>
+The following examples assume a subscription that has an ID of `123456` and a label of `Web Server`
+</p>
+
+Minimal `configuration.yaml` (produces `binary_sensor.vultr_web_server`):
+```yaml
+binary_sensor:
+  - platform: vultr
+    subscription: 123456
+```
+
+Full `configuration.yaml` (produces `binary_sensor.totally_awesome_server`):
+```yaml
+binary_sensor:
+  - platform: vultr
+    name: totally_awesome_server
+    subscription: 12345
+```
+
+Configuration variables:
+
+- **subscription** (*Required*): The subscription you want to monitor, this can be found in the URL when viewing a server
+- **name** (*Optional*): The name you want to give this binary sensor, defaults to `Vultr {subscription label}`