Add Eloquent JS Object Oriented Notes

[mikeronewman]

I've been reading Eloquent JS and taking tons of notes. I'd love to to add to the notes section with some examples on object oriented javascript from chapter 6.

[sohamsshah]

Hi @mikeronewman This sounds really good. We need rockstar contributors like you at the Repo haha ;) Thanks for the interest, feel free to make a PR, will love to add it to the repository