Add values to for a property of the resource
Example: $resource->add('prefix:property', 'value');
mixed $property The property name:
mixed $value The value for the property:
integer The number of values added (1 or 0)
public function add($property, $value) {
$this
->checkHasGraph();
return $this->graph
->add($this->uri, $property, $value);
}