Create intro-to-javascript.md

[R3IDV3]

Do you think we should use the form:

function sayHello() {
  // stuff
}

OR

sayHello = function() {
  // stuff
};

??

[albertywchan]

I feel like the first form is easier to understand because the syntax is closer to other languages i've worked with.

[R3IDV3]

I agree!

[joanna-chen]

go with the first one if we're targeting more of the beginners i would say

[R3IDV3]

What do you think of the overall introduction: 71eb3c4