Format code with Prettier and add code style documentation

[natebass]

• Reformat project code with Prettier
• Add documentation/ folder and Code_style.md

The changes do not add a lint or formatting config file to the project. It just runs it once and adds documentation for a configuration option to run it again.

I tried to match your existing style and was wondering your feedback on some points @jeremiak.

• 4 space width tabs.
• Always use semi-colons at the end of Javascript statements.
• Single quotes over double quotes.
• Spaces around Javascript objects and import {}. For example, import { thing } from "thing".

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