add JSONSchema.jl to tooling page

[YongHee-Kim]

What kind of change does this PR introduce?

• Adding JSONSchema.jl for Julia to the tools

[github-actions[bot]]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (7ecd915) to head (099d776). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1053 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 10 10 Lines 373 373 Branches 94 94 ========================================= Hits 373 373 ```

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[benjagm]

Thanks a lot for adding your implementation!!!

[github-actions[bot]]

Congratulations, @YongHee-Kim for your first pull request merge in this repository! 🎉🎉. Thanks for your contribution to JSON Schema!