Add documenation for LaCrosse platform (#3829)

* add documenation for lacrosse component

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>

* fix documentation

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>

* change to new style

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>

* fix after changing to new style

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>

* renamed config value

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>

* Add configuration sample

* Revert change

* Add quotes

source/_components/sensor.lacrosse.markdown

@@ -0,0 +1,99 @@
+---
+layout: page
+title: "LaCrosse Sensor"
+description: "Instructions how to integrate LaCrosse sensor data received from Jeelink into Home Assistant."
+date: 2017-10-29 15:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: home-assistant.png
+ha_category: Sensor
+ha_release: 0.58
+ha_iot_class: "Local Polling"
+---
+
+The `lacrosse` sensor platform is using the data provided by a [Jeelink](https://www.digitalsmarties.net/products/jeelink) USB dongle or this [Arduino sketch](https://svn.fhem.de/trac/browser/trunk/fhem/contrib/arduino/36_LaCrosse-LaCrosseITPlusReader.zip).
+
+#### {% linkable_title Tested Devices %}
+
+- Technoline TX 29 IT (temperature only)
+- Technoline TX 29 DTH-IT (including humidity)
+
+## {% linkable_title Setup %}
+
+Since the sensor change their ID after each powercycle/battery change you can check what sensor IDs are availble by using the command-line tool `pylacrosse` from the pylacrosse package.
+
+```bash
+$ sudo pylacrosse -D /dev/ttyUSB0 scan
+```
+To use your `lacrosse` compatible sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: lacrosse
+    sensors:
+      sensor_identifier:
+        type: SENSOR_TYPE
+        id: SENSOR_ID
+```
+
+{% configuration %}
+  device:
+    description: The serial baudrate.
+    required: true
+    type: string
+    default: /dev/ttyUSB0
+  baud:
+    description: The serial baudrate.
+    required: true
+    type: int
+    default: 57600
+  sensors:
+    description: A list of your sensors.
+    required: true
+    type: map
+    keys:
+      name:
+        description: The name of the sensor.
+        required: false
+        type: string
+      type:
+        description: "The type of the sensor. Options: `battery`, `humidity`, `temperature`"
+        required: true
+        type: string
+      id:
+        description: The LaCrosse Id of the sensor.
+        required: true
+        type: int
+{% endconfiguration %}
+
+
+## {% linkable_title Examples %}
+
+To setup a lacrosse sensor with multiple sensors, add the following to your `configuration.yaml` file:
+
+{% raw %}
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: lacrosse
+    device: /dev/ttyUSB0
+    baud: 57600
+    sensors:
+      kitchen_humidity:
+        name: Kitchen Humidity
+        type: humidity
+        id: 72
+      kitchen_temperature:
+        name: Kitchen Temperature
+        type: temperature
+        id: 72
+      kitchen_lacrosse_battery:
+        name: Kitchen Sensor Battery
+        type: battery
+        id: 72
+```
+{% endraw %}
+