Alignment with draft-ietf-ccamp-eth-client-te-topo-yang-01

Uploaded xml and txt file from https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-eth-client-te-topo-yang-01

Uploaded YANG file from YANG catalog

Complied the YANG file with pyang

README.md

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 This is the working area for the [IETF CCAMP](https://datatracker.ietf.org/wg/ccamp/documents/) WG Internet-Draft, "[A YANG Data Model for Ethernet TE Topology](https://datatracker.ietf.org/doc/draft-ietf-ccamp-eth-client-te-topo-yang/)".
 
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 ## Abstract
 
    A transport network is a server-layer network to provide connectivity