Add general print.css

Thank you very much for this great administration theme.
Nobody likes printing things, but we all know customers who do so...

Our current problem is that a customer would like to print a Drupal Commerce order overview page. This request is okay for several reasons, but using Adminimal the print layout is completely broken. There are several white pages, etc...

So the question is: What do you think about a very general print.css style to fix things in general for printers. No perfect print layout but simply something that works.

I'd like to discuss that with you, of course we'd be willing to help!