Adds documentation for the lutron Caseta devices (#2262)

* Adds documentation for the lutron Caseta devices

* corrects the configuration vars section

* Updates docs to sync up with the code PR

* Updates the config section to match the latest code pull request.  Fixes previously identified errors.

source/_components/lutron_caseta.markdown

@@ -0,0 +1,39 @@
+---
+layout: page
+title: "Lutron Caseta"
+description: "Instructions how to use Lutron Caseta devices with Home Assistant."
+date: 2017-01-28 13:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: lutron.png
+ha_category: Hub
+featured: False
+ha_release: 0.41
+---
+
+[Lutron](http://www.lutron.com/) is an American lighting control company.  They have several lines of home automation devices that manage light switches/dimmers, occupancy sensors, HVAC controls, etc.  The `lutron_caseta` component in Home Assistant is responsible for communicating with the Lutron SmartBridge for these systems.
+
+This component only supports the Caseta line of products.  Current only supports Caseta dimmers as Home Assistant lights and caseta wall switches as Home Assistant switches.   
+
+When configured, the `lutron_caseta` component will automatically discover dimmers and switches as setup in the Lutron SmartBridge.
+
+To use Lutron Caseta devices in your installation, add the following to your configuration.yaml file using the IP of your lutron Smartbridge:
+
+``` yaml
+lutron_caseta:
+    host: <ip_address>
+    username: lutron
+    password: integration
+```
+
+Configuration variables:
+
+- **host** (*Required*): The IP address of the Lutron SmartBridge.
+- **username** (*Required*): The login name of the user.  The user `lutron` always exists.
+- **password** (*Required*): The password for the user specified above. `integration` is the password for the always-present `lutron` user.
+
+<p class='note'>
+  It is recommended to assign a static IP address to your Lutron SmartBridge.  This ensures that it won't change IP address, so you won't have to change the `host` if it reboots and comes up with a different IP address.
+</p>