Demo of EU-style vaccination cert

[wabzqem]

This demo app logs in to and pulls real vaccination data from medicare, adds the QR-code to the official PDF, prints it out and verifies it.

The verification is done using the open source Swiss verifier app, modified by hard-coding the corresponding public key in to trust.

Code is available here for iOS/macOS: https://github.com/wabzqem/AU-COVID-vaccine-certs

NOTE: If you run this, your temporary medicare login auth token (not username/password or pin) are sent to my server. I don't log this, or capture it, or do anything except for use it to proxy the vaccine data. But I could, so you should probably not run this yourself. The code is provided as a PoC.

Questions/comments welcome.