Update "README"

[JavaScriptErika]

Update README

• Add Cascading Coder's logo

• Add in Emojis throughout text - don't go too overboard, but enough to make it fun

• Add in Who We Are text (see issue #1 for text)

• See if you can make the markdown display the colors in the style guide section - if not, it's ok! If you know of another way or have a different idea, cool!

• Feel free to reorder as you see fit.

[JavaScriptErika]

[Guilleo03]

I´ll take it