code: public Resources addResources(String... resources) {
  		Resources prop = new Resources(resources);
  		addResources(prop);
  		return prop;
  	}
docs: Adds a list of resources that are needed for the event.
  @param resources the resources to add (e.g. "easel", "projector")
  @return the property that was created
  @see <a href="http://tools.ietf.org/html/rfc5545#page-91">RFC 5545
  p.91</a>
  @see <a href="http://tools.ietf.org/html/rfc2445#page-87">RFC 2445
  p.87-8</a>
  @see <a href="http://www.imc.org/pdi/vcal-10.doc">vCal 1.0 p.34-5</a>