code: public static ResourceRecordSet<TXTData> txt(String name, String txtdata) {
      return new TXTBuilder().name(name).add(txtdata).build();
    }
docs: creates txt set of txt single {@link denominator.model.rdata.TXTData TXT} record for the
  specified name.
  
  @param name    ex. {@code denominator.io.}
  @param txtdata ex. {@code "made in sweden"}