Add component collection

source/_components/media_player.cast.markdown

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+---
+layout: page
+title: "Google Cast support"
+description: "Instructions how to integrate Google Cast into Home Assistant."
+date: 2015-03-23 19:59
+sidebar: false
+comments: false
+sharing: true
+footer: true
+logo: google_cast.png
+ha_category: Media Player
+---
+
+<img src='/images/supported_brands/google_cast.png' class='brand pull-right' />
+Google Cast devices will be automatically discovered if you enable [the discovery component]({{site_root}}/components/discovery.html). There is a issue where Chromecasts can only be discovered if your device is connected to the same subnet as your Chromecast.
+
+Chromecast platform can also be forced to load by adding the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+media_player:
+  platform: chromecast
+  host: 192.168.1.9
+```
+
+Configuration variables:
+
+- **host** *Optional*: Use only if you don't want to scan for devices.
+