added xx.yang to test validation scripts

module xx {

  yang-version 1.1;

  namespace "urn:3gpp:xxx";

  prefix "xxgpp";

  import ietf-yang-types { prefix yang; }

  organization "3GPP SA5";

  contact "https://www.3gpp.org/DynaReport/TSG-WG--S5--officials.htm?Itemid=464";

  description "Test module to test eforge validation scripts";

  reference "3GPP TS 28.623";

  revision 2022-07-26 { reference CR-xx ; }

  leaf xx { type string }

}

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