Add component documentation for media_player/anthemav (#1701)

* media_player/anthemav: Initial Commit

Adding preliminary component page for media_player/anthemav with logo and
rudimentary configuration information.  This is just a placeholder so I could
verify my local rake setup and confirm that I can maintain the page.

* media_player/anthemav component page content

* Presuming version 0.36 for next release

* Why does my proofreading ability only improve post commit?

* Amend options to reflect changes in platform

* Style changes for conformity

* Copy Paste Foul

source/_components/media_player.anthemav.markdown

@@ -0,0 +1,71 @@
+---
+layout: page
+title: "Anthem A/V Receivers"
+description: "Instructions how to integrate Anthem A/V Receivers into Home Assistant."
+date: 2016-12-31 23:11
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: anthemav.png
+ha_category: Media Player
+ha_iot_class: "Local Push"
+ha_release: 0.36
+---
+
+Both [Anthem]'s current and last generation of A/V Receivers and and Processors
+support IP-based, network control.  This Home Assistant platform adds proper
+"local push" support for any of these receivers on your network.
+
+## {% linkable_title Supported Models %}
+
+* MRX 520, MRX 720, MRX 1120, and AVM 60
+* MRX 310, MRX 510, MRX 710
+
+Support is provided through the Python [anthemav] module.  Older, RS-232
+serial-based units like the D2v use a different protocol entirely and are not
+currently supported.
+
+[Anthem]:	http://www.anthemav.com/
+[anthemav]: https://github.com/nugget/python-anthemav
+
+
+## {% linkable_title Configuration %}
+
+```yaml
+# Example configuration.yaml entry
+media_player:
+  - platform: anthemav
+    host: 10.0.0.42
+    port: 14999
+```
+
+### Configuration Variables
+
+- **host** (*Required*): The host name or address of the device.
+- **port** (*Optional*): The port number. Defaults to 14999.
+- **name** (*Optional*): The name of the device used in the frontend.
+
+## Notes and Limitations
+
+- The tuner is currently unsupported as are the `media_player` play, pays,
+  prev, and next controls.
+
+- Enabling this platform will set and enforce "Standby IP Control On" in your Anthem
+  device.  You almost certainly want this.  If you disable it on the device, it
+  will just get re-enabled by Home Assistant.
+
+- Only Zone 1 is currently supported.
+
+<p class='note warning'>
+  This platform will maintain a persistent connection to the network control
+  port which will prevent any other application from communicating with the
+  receiver.  This includes the Anthem iOS and Android remote control apps as
+  well as the ARC-2 Anthem Room Calibration software. You will need to disable
+  this platform and restart Home Assistant if you want to use another
+  application that makes use of the network control port.
+  <br /><br />
+  *The underlying Python module has hooks for halting and resuming the network
+  connection but those functions are currently unsupported by the Home
+  Assistant platform.*
+</p>