doc for new media_player platform volumio (#2202)

* Create media_player.volumio.markdown

* Update media_player.volumio.markdown

* Update media_player.volumio.markdown

Correct capitalization and formatting of configuration example.

* Update media_player.volumio.markdown

Add yaml syntax highlighting for config example.

* Update media_player.volumio.markdown

Remove optional config variables from config example.

* Add logo for Volumio media player

* Update volumio with release and logo

source/_components/media_player.volumio.markdown

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+---
+layout: page
+title: "Volumio Media Player"
+description: "How to set up the Volumio media player platform"
+date: 2017-03-04
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: volumio.png
+ha_category: Media Player
+ha_release: 0.41
+---
+
+The `Volumio` platform allows you to control a [Volumio](http://volumio.org) media player
+from Home Assistant.
+
+
+To add a Volumio player to your installation, add the following to
+your `configuration.yaml` file.
+
+```yaml
+# Example configuration.yaml entry
+media_player:
+  - platform: volumio
+    host: homeaudio.local
+    port: 3000
+```
+
+Configuration variables:
+
+- **name** (*Optional*): Name of the device
+- **host** (*Required*): IP address or hostname of the device
+- **port** (*Required*): Port number of Volumio service