Updated README.md

Updated README.md to include team members, team name "Team Aluminum
Falcon Overdrive" and various tweaks to the document's language.
-Travis
Added art-styles directory and contents

Added a new directory: art-styles that contains art-style images from
popular video games to consider for inspiration for Snail.

Added README.md with explanations behind why I think these art styles
could be useful. Will discuss with Garrett next.
-Travis