Add Azure Sphre bootcamp sample model for AVNET Starter Kit

[JuergenSchwertl]

Thank you for contributing to the IoT Plug and Play Models repository

📝 Please review this checklist before submission

• [ X ] The models submitted in this PR follow the DTDL Naming Guidelines for contributing to this repository.
• [ X ] dmr-client validate -m "AVNETSK-1.json" -r https://raw.githubusercontent.com/JuergenSchwertl/iot-plugandplay-models/main
  [Validating]: C:\Repos\iot-plugandplay-models\dtmi\azsphere\spherettt\AVNETSK-1.json

• Validating model file content conforms to DTDL version 2.
  Validation passed without errors

• [ X ] I understand once the PR is approved, the models are considered immutable: any edits will require to submit new files.
• [ X ] No new top level namespace added

PR Info Template

Company Info

• Microsoft Deutschland GmbH
• www.microsoft.com
• Azure Sphere bootcamp samples repo: https://github.com/JuergenSchwertl/AzureSphereSamples

IoT Plug and Play Device Info

AVNET Azure Sphere Starter Kit (rev1 and rev2)
https://www.avnet.com/wps/portal/us/products/avnet-boards/avnet-board-families/ms-azure-sphere/
Azure Sphere OS on Mediatek MT3620 micro-controller (ARM A7 & M4)

Model Submission Goals

Azure IoT Central integration for AVNET Starter Kit development boards during Azure Sphere bootcamp workshops

Code Owners & Reserved Names

@JuergenSchwertl ( https://github.com/JuergenSchwertl, [email protected] )

[JuergenSchwertl]

Uppercase file name undetected by dmr-client running on Windows.