provide json schema of config file

[hezhengxu2018]

like lerna, the json schema path has added to its config file after lerna init.
"$schema": "node_modules/lerna/schemas/lerna-schema.json"
provide the json schema would improve user experience，user can write config file without doc.

[ChromeGG]

Bump, also looking for this feature :)

[webpro]

That would be a nice feature indeed, if someone is willing to create and submit a JSON Schema file that would be great.

There's also ideas to add types in #1055.

[juancarlosjr97]

Cool idea! What is everyone's thought on having it centralized instead of part of the installation, the same as Renovate schema for example.

  "$schema": "https://docs.renovatebot.com/renovate-schema.json",