[ENHANCEMENT] add support for pkpass files

[ulrich-mayer]

Is your feature request related to a problem? Please describe.
I was not able to import flight tickets/car parking lot provided in pkpass format:
https://en.m.wikipedia.org/wiki/PKPASS

Describe alternatives you've considered
I was able to use the image I also received by mail, but not with the wallet.

I can provide a sample pkpass file, however github would not let me attach it.

[michaeltroger]

Thx for your interest in the app!
At this point there is no plan to support the PKPASS format. Currently only PDF would be supported.
I will keep your issue open to see the demand for this feature.

[Chepycou]

I upvote this, it would come handy IMO