Adding Jsonnet syntax highlighting to the upstream

[nawordar]

Hello,
I would like to add the Jsonnet syntax highlighting definition from this repository to the upstream Vim repository. Can I get your permission to do that?

Also, the last commit to this repository is from three years ago. Is this plugin outdated, or has Jsonnet not changed since then?

Relevant issue: vim/vim#11073

[sparkprime]

You can do that, in fact it would be great if someone else were to maintain this.