Add code coverage tool

[sesispla]

It took ages... but finally this PR fixes #16

What we get (sample from my Codacy project):

• A very nice dashboard to control code quality
• Quality control
• Code coverage

Before completing this PR, there are some setup and changes from kubernetes-client owners (@brendanburns?):

• SETUP: Add a new Codacy project for kubernetes-client
• SETUP: Get Codacy coverage token from Coverage page
• SETUP: Create a new TravisCI Environment Variable called CODACY_PROJECT_TOKENand add the Codacy coverage token
• CHANGE: Change all Codacy references from my repo to Kubernetes-client (badges in readme.md, mainly).

[k8s-ci-robot]

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[sesispla]

PS: The job fails because of pending tasks:

01/05 14:23:48 ERROR c.c.rules.ConfigurationRules:22 - Invalid configuration: Project token not provided and not available in environment variable "CODACY_PROJECT_TOKEN"

[brendandburns]

Thanks! I'll see about getting this setup...

[tg123]

Close as Azure pipeline setup