Add Kumho Electric SmartMesh Gateway PnP Model

[KumhoElectricLJH]

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• [ ] :eyes: The models submitted in this PR follow the DTDL Naming Guidelines for contributing to this repository.
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PR Info Template

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Company Info

• Company name : Kumho Electric
• Company website : https://www.khe.co.kr/en/

IoT Plug and Play Device Info

• Product website : https://www.khe.co.kr/en/
• OS & Arch : Azure Sphere
• SDK used for model implementation : Azure SDK

Model Submission Goals

• Device certification
• Presence in the Certified Device catalog

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If no alias is specified then we assume the PR submitter is responsible for the namespace.

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[KumhoElectricLJH]

When will it be merged?