json schema

[o-az]

starting off the work on defining JSON schema for MESC. The schema url can them be imported into MESC config file by any user to provide types and autocomplete.

Example:

{
  "$schema": "https://raw.githubusercontent.com/o-az/mesc/6d5bb39c1cbcea06d3467f5788763bda73d9c2d7/schema.json",
  // ...
}