add .devcontainer specs

[akyriako]

The dev container should per minimum provide the following features:

• Docker in Docker
• Kubernetes cluster based on KinD
• Private container registry for KinD
• Golang
• Operator SDK
• K9s
• Dive for Docker images

and should target primarily working with vscode as an IDE

[nesangcode]

What is .devcontainer?

[akyriako]

Hi @k124k3n dev containers are containers that can be used to develop/run an application that are including the necessary tools, libraries, or runtimes for working with the codebase. Every new developer doesn't need to setup his machine to start develop, instead a preconfigured environment is spawned as a container and eventually he doesn't need to bother figuring any dependencies or tools, saving that way time and insuring that everybody is working in identical environments reducing that way the entropy between the maintainers. Check the link below:

https://containers.dev