Add Kubernetes native Java + Maven sample and describe flow of the application development in Che

[mmorhun]

The goal of this issue is to provide a Kubernetes native sample application in Che with complete flow of its development.
Requirements:

• Che sample with Kubernetes native application (could be used an existing sample)
• The sample application should contain deployment yaml file
• Devfile for Che workspace with commands and required plugins (Kubernetes, GYP ?)
• Readme file in the sample how to perform all the operations: from project build to deploy.

[che-bot]

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