Added example code the Grove Water Sensor.
Added example code the Grove Water Sensor.

mwittig/steward,estbeetoo/steward,TheThingSystem/steward,TheThingSystem/steward,mwittig/steward,estbeetoo/steward,mwittig/steward,mwittig/steward,TheThingSystem/steward,estbeetoo/steward,estbeetoo/steward,mwittig/steward,TheThingSystem/steward,estbeetoo/steward,mwittig/steward,estbeetoo/steward,mwittig/steward,estbeetoo/steward,TheThingSystem/steward,estbeetoo/steward,TheThingSystem/steward,TheThingSystem/steward,TheThingSystem/steward,mwittig/steward,estbeetoo/steward,mwittig/steward,TheThingSystem/steward