code: public Description addDescription(String description) {
  		Description property = new Description(description);
  		addProperty(property);
  		return property;
  	}
docs: <p>
  Assigns a human-readable description to the calendar as a whole.
  </p>
  <p>
  An iCalendar object can only have one description, but multiple
  {@link Description} properties can exist in order to specify the
  description in multiple languages. In this case, each property instance
  must be assigned a LANGUAGE parameter.
  </p>
  @param description the description
  @return the property object that was created
  @see <a
  href="http://tools.ietf.org/html/draft-ietf-calext-extensions-01#page-6">draft-ietf-calext-extensions-01
  p.6</a>