OpenJobDescription/openjd-cli

AI Summary: The OpenJD CLI currently lacks a way to display its version, as it's not available via a dedicated argument or in the help text. The proposed solution is to implement a `--version` or `-v` flag to output the CLI's version (e.g., `OpenJobDescription CLI X.Y.Z`), and also include this information in the main help output. This would allow users to easily check their installed version for verification or update purposes.