feat: create app to get diffpy.cmi version

[cadenmyers13]

closes #7

New CLI commands -V and -h. Also link to docs is presented.

[cadenmyers13]

Had to force-push because of conflicts i missed in pre-commit.

[codecov]

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[cadenmyers13]

@sbillinge @bobleesj Is there any reason why we dont have this baked in to scikit-package? this seems like a simple and useful tool.

[cadenmyers13]

This link is broken right now, but in the future this will be the link we use

[cadenmyers13]

@sbillinge This general format I got from pdfgui and chatGPT. ready for review

[sbillinge]

I can't merge with a force-push. I am afraid we have to do it over. Of course I don't have to tell you to be running pre-commit locally to avoid conflicts, but a simple git pull from your origin will get the CI induced pre-commit changes. If you have a default setting that git pull does a rebase and not a merge, then change your settings...... Then you won't generate a force-push.

Re @bobleesj, it does seem like the --version behavior would be good to have in skpkg