feat(docs): JSON schemas

[tarampampam]

Reason for This PR

Json-schemas are useful for unit-testing (tests will be implemented later) and will be used for registration on https://www.schemastore.org/json/ (use-case - IDE type hinting).

I have been decided to locate schemas inside this repository because this looks like the simplest way to updates them in the future.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [ ] The reason for this PR is clearly provided (issue no. or explanation).
• [ ] The description of changes is clear and encompassing.
• [ ] Any required documentation changes (code and docs) are included in this PR.
• [ ] Any user-facing changes are mentioned in CHANGELOG.md.
• [ ] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #55 (90f64ec) into master (2200977) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #55   +/-   ##
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  Coverage   50.83%   50.83%           
=======================================
  Files          11       11           
  Lines         301      301           
=======================================
  Hits          153      153           
  Misses        137      137           
  Partials       11       11           

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