k8s_CKA.md

1. https://github.com/walidshaari/Kubernetes-Certified-Administrator
2. https://docs.google.com/spreadsheets/d/10NltoF_6y3mBwUzQ4bcQLQfCE1BWSgUDcJXy-Qp2JEU/edit#gid=0
3. https://suraj.io/post/road-to-cka/