add jquery.ztree v3.5.15

Hello,
I wanna add a jQuery tree plugin - zTree to this project, "zTree is a multi-functional 'tree plug-ins.' based on jQuery. The main advantages of zTree includes excellent performance, flexible configuration, and the combination of multiple functions., you can find more detail about it on http://www.ztree.me/ & https://github.com/zTree/zTree_v3/ (though I think there are some problems on their website now)
If I need to do something more to match this project's format, please tell me.
Thanks.