Add yr.no docs

source/_components/sensor.yr.markdown

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+---
+layout: component
+title: "YR"
+description: "Instructions how to integrate Yr.no within Home Assistant."
+date: 2016-01-04 14:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: yr.png
+ha_category: Weather
+---
+
+
+The `yr` platform uses [YR](http://www.yr.no/) as an source for current meteorological data for your location.
+
+To add YR to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: yr
+  monitored_conditions:
+    - weather
+    - temperature
+    - wind_speed
+    - humidity
+    - pressure
+    - clouds
+    - rain
+    - snow
+```
+
+Configuration variables:
+
+- **monitored_conditions** array (*Required*): Conditions to display in the frontend.
+  - **symbol**: A human-readable text summary.
+  - **temperature**: The current temperature.
+  - **humidity**: The relative humidity.
+  - **fog**: Fog.
+  - **pressure**: The sea-level air pressure in millibars.
+  - **precipitation**: The precipitation.
+  - **dewpointTemperature**: The dew point temperature.
+  - **windSpeed**: The wind speed.
+  - **windDirection**: Where the wind is coming from in degrees, with true north at 0° and progressing clockwise.
+  - **cloudiness**: The cloudiness.
+  - **lowClouds**: Low cloud level.
+  - **mediumClouds**: Medium cloud level.
+  - **highClouds**: High cloud level.
+