Add some more component descriptions

source/components/media_player.markdown

@@ -0,0 +1,50 @@
+---
+layout: page
+title: "Media Player"
+description: "Instructions how to setup your media players with Home Assistant."
+date: 2015-01-24 14:39
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+Interacts with media players on your network. Currently only supports Chromecasts. These will be automatically discovered if you setup [the discovery component]({{site_root}}/components/discovery.html). Can also be forced to load by adding the following lines to your `configuration.yaml`:
+
+```
+media_player:
+  platform: chromecast
+```
+
+<p class='note warning'>
+Chromecasts have recently received a new API which is not yet supported by Home Assistant. Therefore we currently can only detect them and do not know what they are up to.
+</p> 
+
+## Services
+
+### Media control services
+Available services: `turn_off`, `volume_up`, `volume_down`, `media_play_pause`, `media_play`, `media_pause`, `media_next_track`
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id`            |      yes | Target a specific media player. Defaults to all.
+
+### Media play services
+
+There are three services to start playing YouTube video's on the media player.
+
+#### Service `media_player/play_youtube_video`
+Service to start playing a YouTube vide on the media player. 
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id`            |      yes | Target a specific media player. Defaults to all.
+| `video`                |       no | YouTube video to be played, ie. `L0MK7qz13bU`
+
+
+#### Service `media_player/start_fireplace` and `media_player/start_epic_sax`
+Will either start a fireplace or Epic Sax Guy 10h on the media player.
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id`            |      yes | Target a specific media player. Defaults to all.