Add Volkszaehler docs (#6081)

source/_components/sensor.volkszaehler.markdown

@@ -0,0 +1,79 @@
+---
+layout: page
+title: "Volkszaehler"
+description: "Instructions on how to integrate Volkszaehler sensors into Home Assistant."
+date: 2018-08-25 08:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: volkszaehler.png
+ha_category: System Monitor
+ha_iot_class: "Local Polling"
+ha_release: 0.78
+---
+
+The `volkszaehler` sensor platform is consuming the system information provided by the [Volkszaehler](https://wiki.volkszaehler.org/) API.
+
+## {% linkable_title Configuration %}
+
+To enable the Volkszaehler sensor, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: volkszaehler
+    uuid: DEVICE_UUID
+```
+
+{% configuration %}
+uuid:
+  description: The UUID of the device to track.
+  required: true
+  type: string
+host:
+  description: The IP address of the host where Volkszaehler is running.
+  required: false
+  type: string
+  default: localhost
+port:
+  description: The port where Volkszaehler is listening.
+  required: false
+  type: int
+  default: 80
+name:
+  description: The prefix for the sensors.
+  required: false
+  type: string
+  default: Volkszaehler
+monitored_conditions:
+  description: Entries to monitor.
+  required: false
+  type: map
+  default: average
+  keys:
+    average:
+      description: The average power.
+    consumption:
+      description: The power consumption.
+    max:
+      description: The maximum power.
+    min:
+      description: The minimum power.
+{% endconfiguration %}
+
+## {% linkable_title Full examples %}
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: volkszaehler
+    host: demo.volkszaehler.org
+    uuid: '57acbef0-88a9-11e4-934f-6b0f9ecd95a8'
+    monitored_conditions:
+      - average
+      - consumption
+      - min
+      - max
+```
+