Add VS Code devcontainer

[fetherolfjd]

Is your feature request related to a problem? Please describe.

A development environment complete with all the tools and settings necessary to develop and test ansible-nas would be great. It would ensure all contributors are using the same tools and versions, and serve as self documentation.

Describe the solution you'd like

VSCode devcontainers.

Describe alternatives you've considered

Simple documentation that enumerates tools and expectations for development and testing.

[fetherolfjd]

I personally love devcontainers because they remove all the guesswork and toil of setting up development environments. Has this ever been discussed?

The biggest downside is that anyone not using VSCode would be excluded from the benefits.