added readme file

readme.md

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+ZenCoding-vim
+====
+[zencoding-vim](http://github.com/mattn/zencoding-vim.git) is vim script support for expanding abbreviation like zen-coding.
+
+Installation
+---
+
+[Download zip
+file](http://www.vim.org/scripts/script.php?script_id=2981)
+  cd ~/.vim
+  unzip zencoding-vim.zip
+
+If you install pathogen.vim:
+  cd ~/.vim/bundle # or make directory
+  unzip /path/to/zencoding-vim.zip
+
+If you get source from repository:
+  git clone http://github.com/mattn/zencoding-vim.git
+  cd ~/.vim/bundle # or make directory
+
+