Add documentation for cmus media player (#568)

source/_components/media_player.cmus.markdown

@@ -0,0 +1,43 @@
+---
+layout: page
+title: "cmus"
+description: "Instructions how to integrate cmus Music Player into Home
+Assistant."
+date: 2016-06-17 18:45
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Media Player
+---
+
+
+The `cmus` platform allows you to control a [cmus](https://cmus.github.io/) music player on a remote or local machine from Home Assistant.
+
+To add cmus to your installation, add the following to your `configuration.yaml` file if cmus is running on a remote server:
+
+```yaml
+# Example configuration.yaml entry
+media_player:
+  platform: cmus
+  host: IP_ADDRESS
+  port: 3000
+  password: PASSWORD
+  name: Desktop Computer Music Player
+```
+
+if running locally it will look like:
+```yaml
+# Example configuration.yaml entry
+media_player:
+  platform: cmus
+  name: Local Music Player
+```
+
+Configuration variables:
+
+- **host** Hostname or IP address of the machine running cmus. Note if a remote
+cmus is configured that instance must be configured to listen to remote connections, which also requires a password to be set.
+- **password** (*Required if host is set*): Password for your cmus player.
+- **port** (*Optional*): Port of the cmus socket, defaults to 3000.
+- **name** (*Optional*): The name you'd like to give the cmus player in Home Assistant