Create light.knx.markdown (#2534)

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+---
+layout: page
+title: "KNX Light"
+description: "Instructions on how to integrate KXN lights with Home Assistant."
+date: 2016-06-24 12:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: knx.png
+ha_category: DIY
+ha_release: 
+ha_iot_class: "Local Polling"
+---
+
+
+The `knx` light component is used as in interface to switching/light actuators.
+
+To use your KNX light in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+light:
+  - platform: knx
+    name: KNX light
+    address: 0/0/1
+```
+
+- **name** (*Optional*): A name for this devices used within Home assistant
+- **address** (*Required*): The KNX group address that is used to turn on/off this actuator channel
+- **state_address** (*Optional*): Some KNX devices can change their state internally without any messages on the KXN bus, e.g. if you configure a timer on a channel. The optional `state_address` can be used to inform Home Assistant about these state changes. If a KNX message is seen on the bus addressed to the given state address, this will overwrite the state of the switch object.
+For switching/light actuators that are only controlled by a single group address and can't change their state internally, you don't have to configure the state address.
+