Add simple README with screenshot

README.md

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+# ibuffer-vc: Group buffers in ibuffer list by VC project #
+
+Adds functionality to Emacs' ibuffer-mode for grouping buffers by
+their parent vc root directory, and for displaying and/or sorting by
+the vc status of listed files.
+
+## Screenshot ##
+
+![ibuffer-vc screenshot](http://i.imgur.com/RUYRJ.png)
+
+## How to install ##
+
+See `ibuffer-vc.el`, or (preferred) install from [Marmalade][Marmalade] or [Melpa][Melpa].
+
+
+[Melpa]: http://melpa.milkbox.net "Melpa"
+[Marmalade]: http://marmalade-repo.org "Marmalade"
+