This is a complete user interface replacement addon. If you have any questions regarding usage I recommend you make a post inside the ElvUI section on http://www.tukui.org.
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What is ElvUI?
The purpose of ElvUI is lightweight user interface designed to replace the one provided by Blizzard. A single addon, complete package, with a minimalistic look.
What is the minimum requirement?
There are no requirements! That's right! you can customize almost every portion of the UI to fit your screen.
What is new in v3?
ElvUI v3 was a complete rewrite. The biggest change you'll notice is there are hardly any reloadui's anymore when changing settings. The goal of v3 was to make customizing the UI extremely easy without having to do any lua edits to get the look you want.