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/sensor.vultr.markdown

@@ -0,0 +1,59 @@
+---
+layout: page
+title: "Vultr Sensor"
+description: "Instructions on how to integrate Vultr sensor within Home Assistant."
+date: 2017-10-17 21:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: vultr.png
+ha_release: "0.57"
+ha_category: System Monitor
+ha_iot_class: "Cloud Polling"
+---
+
+
+The `vultr` sensor will allow you to view current bandwidth usage and pending charges against your [Vultr](https://www.vultr.com/) subscription.
+
+To use this sensor, you must 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 `sensor.vultr_web_server_current_bandwidth_used` and `sensor.vultr_web_server_pending_charges`):
+```yaml
+sensor:
+  - platform: vultr
+    subscription: 123456
+```
+
+Full `configuration.yaml` using `{}` to format condition name (produces `sensor.server_current_bandwidth_used` and `sensor.server_pending_charges`):
+```yaml
+sensor:
+  - platform: vultr
+    name: Server {}
+    subscription: 123456
+    monitored_conditions:
+      - current_bandwidth_used
+      - pending_charges
+```
+
+Custom `configuration.yaml` with only one condition monitored (produces `sensor.web_server_bandwidth`):
+```yaml
+sensor:
+  - platform: vultr
+    name: Web Server Bandwidth
+    subscription: 123456
+    monitored_conditions:
+      - current_bandwidth_used
+```
+
+Configuration variables:
+
+- **subscription** (*Required*): The Vultr subscription to monitor, this can be found in the URL when viewing a subscription
+- **name** (*Optional*): The name to give this sensor, defaults to `Vultr {Vultr subscription label} {monitored condition name}`.
+- **monitored_conditions** array (*Optional*): List of items you want to monitor for each subscription. Defaults to all of them if omitted.
+  - **current_bandwidth_used**: The current (invoice period) bandwidth usage in Gigabytes (GB).
+  - **pending_charges**: The current (invoice period) charges that have built up for this subscription. Value is in US Dollars (US$).