Add an example for the cookbook

source/cookbook/automation_for_rainy_days.markdown

@@ -0,0 +1,57 @@
+---
+layout: page
+title: "Automation for rainy days"
+description: "Basic example how to use weather conditions to set states"
+date: 2015-10-08 19:05
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+### Rainy Day Light ###
+
+This requires a [forecast.io](components/sensor.forecast.html) sensor with the condition `weather_precip` that tells if it's raining or not.
+
+Turn on a light in the living room when it starts raining, someone is home, and it's afternoon or later.
+
+```yaml
+automation:
+  alias: 'Rainy Day'
+
+  trigger:
+       - platform: state
+         entity_id: sensor.weather_precip
+         state: 'rain'
+       - platform: state
+         entity_id: group.all_devices
+         state: 'home'
+       - platform: time
+         after: '14:00'
+         before: '23:00'
+
+  condition: use_trigger_values
+
+  action:
+    execute_service: light.turn_on
+    service_entity_id: light.couch_lamp
+```
+
+And then of course turn off the lamp when it stops raining but only if it's within an hour before sunset.
+
+```yaml
+  alias: 'Rain is over'
+  trigger:
+       - platform: state
+         entity_id: sensor.weather_precip
+         state: 'None'
+       - platform: sun
+         event: 'sunset'
+         offset: '-01:00:00'
+
+  condition: use_trigger_values
+  action:
+    execute_service: light.turn_off
+    service_entity_id: light.couch_lamp
+```
+