inits content

Author: mhausenblas

README.md

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+* [Early Release, April 2019](https://learning.oreilly.com/library/view/programming-kubernetes/9781492047094/)
+* [Full table of contents](https://mhausenblas.info/pk8s/toc.pdf)
+* Go code examples:
+  * [cnat](https://github.com/programming-kubernetes/cnat): example custom controller & resources (Operator SDK/ Kubebuilder)
+  * [custom-apiserver](https://github.com/programming-kubernetes/custom-apiserver): example custom API server