feat: json schema

[EmilyGraceSeville7cf]

There are several possible ways of utilizing this schema (YAML extension is required in VS Code to make them work):

• It can be referenced directly # yaml-language-server: $schema={{schema url in this repository}} in clive.yml, this is a manual approach because requires user to put a full URL by hand.
• It can be put in SchemaStore and referenced there like this. This approach ensures that whenever user edits clive.yml they get the latest hints for it.

If this PR is accepted this schema is referenced in SchemaStore to automatically enable validation for clive.yml.

[EmilyGraceSeville7cf]

@koki-develop, please review this PR.

[koki-develop]

Thank you! This is really helpful.