Hi Nikhil,
It's best to post messages on the Privly Mailinglist[0] as it allows the
potential mentors to see that you're interested in the project and help you
out accordingly.
Since you're interested in the JavaScript side of things, I'd suggest you to read up
the development guide[1]. I'd also suggest reading the guidelines for applicants wiki[2]
to get a better idea of how to apply for GSoC.
Having said that,
No one is participating in GSoC 2016 (yet). Organizations start
applying tomorrow, and Google publishes the list of organizations at
the end of the month.
I can only say that we intend to write and submit an application over
the next week and a half.
-Shivam