code: func (d *DataBagService) CreateItem(databagName string, databagItem DataBagItem) (err error) {
  	body, err := JSONReader(databagItem)
  	if err != nil {
  		return
  	}
  	path := fmt.Sprintf("data/%s", databagName)
  	return d.client.magicRequestDecoder("POST", path, body, nil)
  }
docs: // CreateItem adds an item to a data bag
  //   Chef API Docs: http://docs.getchef.com/api_chef_server.html#id21