Add climate docs

source/_components/climate.knx.markdown

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+---
+layout: page
+title: "KNX Thermostat"
+description: "Instructions on how to integrate KXN thermostats 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: 0.25
+---
+
+
+The `knx` climate platform is used as in interface with KNX thermostats.
+
+KNX thermostats use at least 2 group addresses: one for the current temperature and one for the target temperature (named set-point in KNX terms).
+
+To use your KNX thermostats in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+climate:
+  - platform: knx
+    name: KNX Thermostat
+    temperature_address: 0/1/1
+    setpoint_address: 0/1/0
+```
+
+- **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
+- **temperature_address** (*Required*): The group address that is used to communicate the current temperature. Data format must be datapoint type 9.001 DPT_Value_Temp (2-Octet float value) (see http://www.knx.org/fileadmin/template/documents/downloads_support_menu/KNX_tutor_seminar_page/Advanced_documentation/05_Interworking_E1209.pdf)
+- **setpoint_address** (*Required*): The group address that is used to set/read the target temperature. Data format must be datapoint type 9.001 DPT_Value_Temp (2-Octet float value). Make sure, you set the read-flag for the thermostat to allow Home Assistant to read the target temperature.
+
+With the current version of the module, no advanced KNX thermostat functionalities (e.g. HVAC mode) are supported.