Add badges about passing JSON-Schema-Test-Suite

[ekzobrain]

Hi. Good work, it's really a great library. It would be nice to add badges that indicate passing official spec tests to README. Like here: https://github.com/davishmcclurg/json_schemer?tab=readme-ov-file#build-status

[sagold]

Hey Dmitry,

thank you for the reference. I tried to access individual test-results already, but github didnt seem allow references to specific test-results. I will take a look at the reference repository on how they do it.

Cheers,
Sascha