provide additional package for users that want conversion to & from json

[SingingBush]

[SingingBush]

dub provides functionality to convert between SDL and Json. It'd be convenient to use this test data as a starting point.

I generated a new dub project then ran dub convert --format=json --stdout to see the conversion to json:

name "conversion"
description "Test Data"
authors "samael"
copyright "Copyright © 2018, samael"
license "LGPL"
dependency "vibe-d" version="~>0.8.4"

{
        "name": "conversion",
        "authors": [
                "samael"
        ],
        "dependencies": {
                "vibe-d": "~>0.8.4"
        },
        "description": "Test Data",
        "copyright": "Copyright © 2018, samael",
        "license": "LGPL"
}