[operator] Missing documentation for KIT operator users

******Additional Requirements that we uncovered for KIT operator needs documentation as part of it's installation process for users using KIT operator to not run into these below issues here**** :
- NAT Subnet IGW routing requirement
- Karpenter dependency for KIT and min version like 0.4.1
- Custom tags to subnets required as part for KIT/karpenter to launch nodes to schedule KIT CP pods and KIT DP pods
- DNS issue for dataplane nodes created by KIT where pods have wrong DNS IP in resolv.conf

All these need to be documented as part of README ?, as users need to know this at the time of installation of KIT operator for users wanting to use KIT on KOPS, Testbed etc