Add device kornfeld

[yurenkov]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

[robertcheramy]

Thank you for your submission!
Please correct following points:

• Add your username in the Changelog line (@yurenkov )
• Correct the failed CI (also produced by rake test). See https://github.com/ytti/oxidized/blob/master/CONTRIBUTING.md#create-a-ruby-bundle on how to install a development environment
• Provide a prompt and do not rely on the default prompt (which can be changed in the configuration).
• Please consider providing a device simulation file (https://github.com/ytti/oxidized/blob/master/docs/DeviceSimulation.md) and an expected output for your model (https://github.com/ytti/oxidized/blob/master/docs/ModelUnitTests.md#expected-output). It will help us to maintain it in the future.