Added documentation of the KNX component (#611)

source/components/knx.markdown

@@ -0,0 +1,37 @@
+---
+layout: page
+title: "KNX"
+description: "Instructions on how to integrate KXN compoents with Home Assistant."
+date: 2016-06-08 12:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: knx.png
+ha_category: DIY
+ha_release: 0.24
+---
+
+[KNX/EIB](http://www.knx.org) integration for Home Assistant allows you to connect to a KNX bus. The component requires a local KNX/IP interface like the [Weinzierl 730](http://www.weinzierl.de/index.php/en/all-knx/knx-devices-en/knx-ip-interface-730-en). Through this it will send and receive commands to and from other devices to the KNX bus.
+
+There is currently support for the following device types within Home Assistant:
+
+- [Binary Sensor](../binary_sensor.knx) 
+- [Switch](../switch.knx) 
+
+The local ZigBee device (assuming XBee) must have an up to date Router or Coordinator API firmware installed.
+
+## Configuration
+
+A `knx` section must be present in the `configuration.yaml` file and contain the following options as required:
+
+- **host**: The IP address of the KNX/IP interface to use. You can use "0.0.0.0" if your KNX/IP gateway supports discovery
+
+- **port**: The UDP port number. Default: `3671`
+
+#### Example
+
+```yaml
+knx:
+  host: 192.168.1.12
+```