Added vim documentation file

- From http://sites.google.com/site/vimcctree/cctree.txt
Moved cctree.vim to plugin directory
Move cctree.vim plugin file in the right folder
Remove duplicate code
Merge remote-tracking branch 'sep102/master'
description to markdown (github way)
vim plugin install with manager
Fix directory structure; add doc file
Remove ftplugin directory
merge with original author
Merge remote-tracking branch 'contributors/master'
Merge pull request #1 from albfan/master

Better description and remove duplicate code