MVP JSON Schema file format

[jedrichards]

Create a hand-crafted MVPish v1 of the file format in this repo, using plain JSON Schema. This should act as a conversation starter, and a concrete example that other parties can use to explore the problem space.

@nthState's automatically generated schema can act as a starting point.

We should explore ways of managing a large JSON Schema as part of this process. For example,

• Are there ways of splitting it up into smaller more manageable files, and then combining into the final schema later?
• What tooling is available to lint a schema
• Maybe use prettier to autoformat the JSON consistently
• Etc