Add Proxy support

[kunalspathak]

Thanks for gathering ES6 information. I would love to see ES6 proxy in this.

[DrkSephy]

Proxies are something that I haven't touched at all, but I do plan to introduce some examples in the near future. Perhaps someone else has something to add on Proxies for the time being?

[FredyOmikami]

Get a cat.

[agrahari-himanshu]

I would like to contribute on this

[BazyliszeK27Krk]

Thanks for gathering ES6 information. I would love to see ES6 proxy in this.