Add Johnzon benchmarks

[FibreFoX]

I stumbled over this nice github-repo but Apache Johnzon is missing.

Would you think about this to be a good addition?

[rahmanusta]

I think everyone will welcome if you make a pull request about it ;)

[FibreFoX]

@rahmanusta Just saw Gson and Genson, as Jackson is already present, it was worth a question ;) as I'm not having that much time, I can't do any promise here. But you might want to add some label this being an "enhancement".