Add K8s operators for PGSQL

[CC-Hsu]

Hi, Team,

I notice that this list include Docker images.

It may also be useful to include K8s operators running PGSQL clusters.

I know below lists so far (listed in alphabetic order):

• Crunchy PostgreSQL For Kubernetes
• EDB Cloud Native Postgresql
• Fujitsu Enterprise Postgres Operator
• KubeGres
• StackGres
• stolon postgres operator
• zalando postgres-operator

Maybe you can consider to include this topic. 😊

Best Regards.