Add prezzibenzina documentation (#7843)

* added prezzibenzina

* added full example

* updated docs

* added fuel types

* reverted

* Minor updates

source/_components/sensor.prezzibenzina.markdown

@@ -0,0 +1,64 @@
+---
+layout: page
+title: "PrezziBenzina Sensor"
+description: "Instructions on how to integrate PrezziBenzina sensors within Home Assistant."
+date: 2018-12-14 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: prezzibenzina.png
+ha_category: Energy
+ha_release: 0.85
+ha_iot_class: "Cloud Polling"
+---
+
+The `prezzibenzina` platform allows you to monitor the fuel prices with [PrezziBenzina.it](https://www.prezzibenzina.it/) from within Home Assistant and setup automations based on the information.
+
+## {% linkable_title Setup %}
+
+To use this sensor you need the station ID. To get this information go to [PrezziBenzina.it](https://www.prezzibenzina.it/) with your browser and find your station. Then copy the ID from the URL bar.
+
+```text
+https://www.prezzibenzina.it/distributori/STATION_ID/
+```
+
+## {% linkable_title Configuration %}
+
+To enable this sensor, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: prezzibenzina
+    station: STATION_ID 
+```
+
+{% configuration %}
+station:
+  description: The ID of the station you want to use.
+  required: true
+  type: string
+fuel_types:
+  description: "The types of fuels you want to track. Allowed values are `Benzina`, `Benzina speciale`, `Diesel`, `Diesel speciale`, `GPL` or `Metano`."
+  required: false
+  type: list
+name:
+  description: The name of the station.
+  required: false
+  type: string
+{% endconfiguration %}
+
+## {% linkable_title Full example %}
+
+This is a full example of the sensor:
+
+```yaml
+sensor:
+  - platform: prezzibenzina
+    station: <id>
+    fuel_types: 
+      - "Benzina"
+      - "GPL"
+    name: "Station"
+```