Added documentation for EnOcean component (#515)

* Added documentation for enocean components

* More clearly state the limitations of the EnOcean support

source/_components/sensor.enocean.markdown

@@ -0,0 +1,32 @@
+---
+layout: page
+title: "EnOcean Sensor"
+description: "Instructions how to integrate TellStick sensors into Home Assistant."
+date: 2016-05-26 01:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: enocean.png
+ha_category: Sensor
+---
+
+
+The `enocean` sensor platform currently only allows reading out the power measured in a Permundo PSC234 switch.
+
+To use your EnOcean device, you first have to set up your [EnOcean hub](../enocean) and then add the following to your `configuration.yaml` file:
+
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - name: Television
+    platform: enocean
+    id: [0x01,0x90,0x84,0x3C]
+```
+
+Configuration variables:
+
+- **id** (*Required*): The ID of the device. This is a 4 bytes long number.
+- **platform** (*Required*): Set to `enocean`.
+- **name** (*Required*): An identifier for the switch