Update rfxtrx documentation

source/_components/sensor.rfxtrx.markdown

@@ -12,25 +12,59 @@ ha_category: Sensor
 
 The `rfxtrx` platform support sensors that communicate in the frequency range of 433.92 MHz.
 
-To enable RFXtrx sensors in your installation, add the following to your `configuration.yaml` file:
+First you have to set up your [rfxtrx hub.](/components/rfxtrx/)
+The easiest way to find your sensors is to add this to your `configuration.yaml`:
+```yaml
+sensor: 
+ platform: rfxtrx
+ automatic_add: True
+```
 
+Then when the sensor emits a signal it will be automatically added:
+
+<p class='img'>
+<img src='/images/components/rfxtrx/sensor.png' />
+</p>
+
+Here the name is 0a52080000301004d240259 and you can verify that it works from the frontend. 
+Then you should update your configuration to:
+```yaml
+sensor:
+ platform: rfxtrx
+ devices:
+    0a52080000301004d240259: 
+        name: device_name
+```
+
+If you want to display several data types from one sensor:
+
+```yaml
+sensor: 
+ platform: rfxtrx
+ devices:
+    0a520802060100ff0e0269: 
+        name: Bath
+        data_type: 
+         - Humidity
+         - Temperature
+```
+
+
+
+Example configuration:
 ```yaml
 # Example configuration.yaml entry
 sensor: 
  platform: rfxtrx
  automatic_add: True
  devices:
-   sensor_0502:
+   0a52080705020095220269:
      name: Lving
-     packetid: 0a52080705020095220269
-     data_type: Temperature
-   sensor_0601:
-     name: Bath_Humidity
-     packetid: 0a520802060100ff0e0269
-     data_type: Humidity
-   sensor_0601 2:
-     name: Bath
-     packetid: 0a520802060100ff0e0269
+   0a520802060100ff0e0269:
+        name: Bath
+        data_type: 
+         - Humidity
+         - Temperature
 ```
 
 Configuration variables:
@@ -38,3 +72,4 @@ Configuration variables:
 - **devices**  (*Optional*): A list of devices with their name to use in the frontend.
 - **automatic_add** (*Optional*): To enable the automatic addition of new lights.
 - **data_type**  (*Optional*): Which data type the sensor should show
+