added tip about vundle configutarion after git clone

plugins/vundle/vundle.plugin.zsh

@@ -7,6 +7,7 @@ function vundle-init () {
   if [ ! -d ~/.vim/bundle/vundle/.git/ ]
   then
     git clone http://github.com/gmarik/vundle.git ~/.vim/bundle/vundle
+    echo "\n\tRead about vim configuration for vundle at https://github.com/gmarik/vundle\n"
   fi
 }