Documentation for Météo France sensor (#6938)

* Documentation for Météo France sensor

* update to reflect a correct INSEE code

* Update doc to reflect additional monitored conditions

* remove useless line break

* Update 'ha_release' and fix config sample

source/_components/sensor.meteofrance.markdown

@@ -0,0 +1,86 @@
+---
+layout: page
+title: "Météo-France Sensor"
+description: "Show 1hr rain forecast from Météo-France."
+date: 2018-10-18 08:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: meteo-france.png
+ha_category: Sensor
+featured: true
+ha_release: 0.82
+ha_iot_class: "Cloud Polling"
+---
+
+The `meteo_france` platform uses the [Météo-France](http://www.meteofrance.com/) web service as a source for meteorological data for your location. The location is based on the `postal_code` configured in your `configuration.yaml` file.
+
+## {% linkable_title Configuration %}
+
+To add Météo-France to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: meteo_france
+    postal_code: 76000
+    monitored_conditions:
+      - temperature
+      - weather
+      - wind_speed
+      - uv
+      - next_rain
+      - freeze_chance
+      - rain_chance
+      - snow_chance
+      - thunder_chance
+```
+
+{% configuration %}
+  postal_code:
+    description: Postal code of the city.
+    required: true
+    type: string
+  monitored_conditions:
+    description: The conditions types to monitor.
+    required: true
+    type: list
+    keys:
+      temperature:
+        description: The current temperature.
+      weather:
+        description: A human-readable text summary of the current conditions.
+      wind_speed:
+        description: The wind speed.
+      uv:
+        description: The current UV index.
+      next_rain:
+        description: Time to the next rain if happening for the next hour. (see note below)
+      freeze_chance:
+        description: Probability of temperature below 0°C for the day.
+      rain_chance:
+        description: Probability of rain for the day.
+      snow_chance:
+        description: Probability of snow for the day.
+      thunder_chance:
+        description: Probability of thunderstorm for the day.        
+{% endconfiguration %}
+
+
+### {% linkable_title About `next_rain` condition sensor %}
+
+<p class='note warning'>
+  The 1 hour rain forecast is supported for more than 75% of metropolitan France.<br/>
+  You can check if your city is covered on the [Météo-France website](http://www.meteofrance.com/previsions-meteo-france/previsions-pluie)
+</p>
+
+The `next_rain` sensor value is the time to next rain, from 0 to 55min.
+If no rain is forecasted for the next hour, value will be "No rain".
+
+Attributes also give the forecast for the next hour in 5min intervals.
+Possible value for each intervals attributes are :
+- 1 No rain
+- 2 Light rain
+- 3 Moderate rain
+- 4 Heavy rain