Autopkgtest added for package staden

[harish chavre <harrych_1@yahoo.com>]

Hi team,

I have added autopkgtest for the staden package [0]. The tests  try to include coverage for both the CLI and the graphical interface. Please take a moment to review and share any feedback or suggestions.

[0]https://salsa.debian.org/med-team/staden/-/commit/d540fd92b916d478c0c6e7b75d1db97f823c3ada

Thanks,
Harish