[Project v1.1] Update About Us documentation

[QzSG]

Pull upstream commits from CS2113-AY1819S1-T13-1/main master branch into your own fork master.

Checkout to any branch u like

Go to AboutUs.adoc

Let's put it in alphabetical order so it's more pleasing to read through?

So Adrian -> Chen Song Jian -> Ian -> Lu Han -> Mario

Update the slot for yours based on the above.

The photo of a team member should be doc/images/githbub_username_in_lower_case.png e.g. docs/images/akshay.png

Project Role / Responsibilities : If you really want some role / responsibility just add in, can always modify later.

Create a pull request to CS2113-AY1819S1-T13-1/main docs/about branch

Mention this issue in your pr by simply typing this in the body somewhere #25

I'll do pr to merge to master once all done and no conflicts

Oh right please do latest by Wednesday before 4pm (just get a nice handsome/pretty/cute/etc photo) and change your name.

[T0roloco]

I submitted my PR for #25