Add example of decoded Nova Scotia SHC

[corrmaan]

Generated with https://github.com/obrassard/shc-extractor, but this example is just the "payload" object. There were also "header" and "verirfications" objects that I didn't see in the other examples, and I excluded them assuming that they're ignored somewhere in this project. e.g.:

{
    "header": {
        "zip": "DEF",
        "alg": "ES256",
        "kid": "UJrT9jU8vOCUl4xsI1RZjOPP8hFUv7n9mhVtolqH9qw"
    },
    "payload": {
        ...
    },
    "verifications": {
        "trustable": true,
        "verifiedBy": "UJrT9jU8vOCUl4xsI1RZjOPP8hFUv7n9mhVtolqH9qw",
        "origin": "https://pvc.novascotia.ca/issuer"
    }
}

[straxus]

Thank you very much for this - very helpful!