code: func (a *API) CreateWorksheet(cfg *Worksheet) (*Worksheet, error) {
  	if cfg == nil {
  		return nil, fmt.Errorf("Invalid worksheet config [nil]")
  	}
  
  	jsonCfg, err := json.Marshal(cfg)
  	if err != nil {
  		return nil, err
  	}
  
  	if a.Debug {
  		a.Log.Printf("[DEBUG] create annotation, sending JSON: %s", string(jsonCfg))
  	}
  
  	result, err := a.Post(config.WorksheetPrefix, jsonCfg)
  	if err != nil {
  		return nil, err
  	}
  
  	worksheet := &Worksheet{}
  	if err := json.Unmarshal(result, worksheet); err != nil {
  		return nil, err
  	}
  
  	return worksheet, nil
  }
docs: // CreateWorksheet creates a new worksheet.