add page for openweathermap platform

source/components/sensor.openweathermap.markdown

@@ -0,0 +1,30 @@
+---
+layout: page
+title: "OpenWeatherMap support"
+description: "Instructions how to integrate OpenWeatherMap within Home Assistant."
+date: 2015-04-25 9:06
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+<img src='/images/supported_brands/openweathermap.png' class='brand pull-right' />
+The openweathermap platform uses [OpenWeatherMap](http://openweathermap.org/) as a source for meteorological data for your location. 
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: openweathermap
+  api_key: YOUR_APP_KEY
+  monitored_variables:
+    - type: 'weather'
+    - type: 'temperature'
+    - type: 'wind_speed'
+    - type: 'humidity'
+    - type: 'pressure'
+    - type: 'clouds'
+    - type: 'rain'
+    - type: 'snow'
+```
+