Add PowerShell completion

[rashil2000]

Closes #183

[swsnr]

Please rebase onto main and update CHANGELOG.md, and please check whether the package script correctly includes the new completion file in release tarballs.

[rashil2000]

...please check whether the package script correctly includes the new completion file in release tarballs.

I'm a bit of a beginner here, could you tell me how to do this? Should I simply call the scripts/package shell script?

[swsnr]

@rashil2000 Exactly; you need to make a release build with cargo build --release first. But as far as I'm concerned you can also just check the code of that script to see what it includes; if the file is missing I guess you'll notice on the next release 😉

[rashil2000]

I did that (after setting env variable OUT_DIR=out), but it returns some errors. But when I search for the completion file, I can see it in the target directory:

[swsnr]

@rashil2000 The package script takes arguments; take a look at how it's called in the Github release workflow.

[rashil2000]

Okay, I was able to generate the archive mdcat-0.22.4-x86_64-pc-windows-msvc.zip, and it does contain the PowerShell completion file in the 'completions' folder.