Support Tree function

[sergioRedondoGlobant]

Hi!! im actually starting using this library but sadly for my use case i need to return a tree and the library said that is not supported yet.

If you don't mind i think that i can help with the implementation and make a PR ^^

[wolf4ood]

Hi @sergioRedondoGlobant

thanks for this issue, yes if you have time PRs are welcome :)