Suggestion: Add GitHub topics to help with discoverability

[lb-]

I'd like to suggest that this repo make use of the GitHub topics system.

https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/classifying-your-repository-with-topics

At a minimum, maybe the following topics:

• https://github.com/topics/json
• https://github.com/topics/api
• https://github.com/topics/json-schema

This will really help with discoverability in the GitHub space, I was looking for something like this the other day and it would have come up easier if the topics were used.

Thanks.