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DOC: added readme and documented eks control plane upgrade

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# eks-managed-nodegroup
Create EKS cluster using managed nodegroup. Then performed EKS control plane upgrades.
## Versions and upgrade notes
Based on 1-4 t3.medium worker node with no app pods
| eks-ver | coredns | kube-proxy | vpc-cni | AMI-version | upgrade notes |
|---------|--------------------|---------------------|--------------------|------------------|---------------------------------------------------------------------|
| 1.25 | v1.9.3-eksbuild.10 | v1.25.16-eksbuild.1 | v1.15.4-eksbuild.1 | 1.25.15-20231201 | N/A |
| 1.26 | v1.9.3-eksbuild.10 | v1.26.11-eksbuild.1 | v1.15.4-eksbuild.1 | 1.26.10-20231201 | from 1.25, set cluster_version = "1.26". nodes are recreated. 23min |
| 1.27 | v1.10.1-eksbuild.6 | v1.27.6-eksbuild.2 | v1.15.4-eksbuild.1 | 1.27.7-20231201 | from 1.26, set cluster_version = "1.27". nodes are recreated. 16min |
| 1.28 | v1.10.1-eksbuild.6 | v1.28.4-eksbuild.1 | v1.15.4-eksbuild.1 | 1.28.3-20231201 | from 1.27, set cluster_version = "1.28". nodes are recreated. 26min |
## References
https://repost.aws/knowledge-center/eks-plan-upgrade-cluster