First steps for chrome extension, UserScript version too

Userscript works, but uses jQuery. Going to attempt to unjquerify that
so the code for the userscript and extension is as similar as possible.
The Chrome extension doesn't have access to the window's jQuery
variable, and it seems wasteful to include it just for this.
Hey it works!

Going to refactor some stuff for broader reusability
Everything seems to work again
Moved folder structure a bit
Changed "Project" to "Repository"

Not sure why I called it "Project" in the first place
First go at a readme
Update README.md

Fixed relative user script path