add README

README.md

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+# vim-signify
+
+This plugin started as a port of GitGutter, a famous plugin for Sublime Text 2.
+
+It's fast, highly configurable and well documented.
+
+Features:
+
+- shows added, deleted and changed lines since the last commit via Vim's sign
+  column
+- supports git (other DVCS will follow)
+- you can toggle the plugin per buffer
+- fully configurable through global variables in vimrc
+- good documentation
+
+- quick developer response! ;)
+
+Limits exist only in your mind! Vim on!
+
+## Installation
+
+Just clone it into ~/.vim/bundle/.
+
+## Usage
+
+`:h signify`
+
+## Author
+
+Marco Hinz `<mh.codebro@gmail.com>`
+
+## License
+
+Copyright © 2013 Marco Hinz. Distributed under the same terms as Vim itself (see
+`:help license`).