Documentation for yamaha_musiccast Component (#3295)

* Documentation for yamaha_musiccast Component

* Fix Spelling & Grammar

source/_components/media_player.yamaha_multicast.markdown

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+---
+layout: page
+title: "Yamaha MusicCast Receivers"
+description: "Instructions on how to integrate Yamaha MusicCast Receivers into Home Assistant."
+date: 2017-09-02 22:00 +0100
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: yamaha.png
+ha_category: Media Player
+ha_release: 0.53
+---
+
+The `yamaha_musiccast` platform allows you to control [Yamaha MusicCast Receivers](https://usa.yamaha.com/products/audio_visual/hifi_components/index.html) from Home Assistant.
+
+Supported devices are listed on their [German site](https://de.yamaha.com/de/products/contents/audio_visual/musiccast/products.html).
+
+To add a Yamaha Network Receiver to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+media_player:
+  - platform: yamaha_musiccast
+    host: 192.168.xx.xx
+```
+Configuration variables:
+
+- **name** (*Optional*): Name of the device
+- **host** (*Required*): IP address or hostname of the device
+- **port** (*Optional*): UDP Port
+
+A few notes:
+
+- Currently, this component supports powering on/off, mute, volume control, and source selection. Playback controls, for instance, play and stop are available for sources that support it.
+
+A full configuration example will look like the sample below:
+```yaml
+# Example configuration.yaml entry
+media_player:
+  - platform: yamaha_musiccast
+    name: "Living Room"
+    host: 192.168.178.97
+    port: 5005
+```