Moved comments and credits from source to README

plugins/fancy-ctrl-z/README.md

+# Use Ctrl-Z to switch back to Vim
+
+I frequently need to execute random command in my shell. To achieve it I pause 
+Vim by pressing Ctrl-z, type command and press fg<Enter> to switch back to Vim.
+The fg part really hurt sme. I just wanted to hit Ctrl-z once again to get back 
+to Vim. I could not find a solution, so I developed one on my own that 
+works wonderfully with ZSH
+
+Source: http://sheerun.net/2014/03/21/how-to-boost-your-vim-productivity/
+
+Credits: 
+- original idea by @sheerun
+- added to OMZ by @mbologna
+

plugins/fancy-ctrl-z/fancy-ctrl-z.plugin.zsh

-# Use Ctrl-Z to switch back to Vim
-# I frequently need to execute random command in my shell. To achieve it I pause 
-# Vim by pressing Ctrl-z, type command and press fg<Enter> to switch back to Vim.
-# The fg part really hurt sme. I just wanted to hit Ctrl-z once again to get back 
-# to Vim. I could not find a solution, so I developed one on my own that 
-# works wonderfully with ZSH
-#
-# Source: http://sheerun.net/2014/03/21/how-to-boost-your-vim-productivity/
-
 fancy-ctrl-z () {
   if [[ $#BUFFER -eq 0 ]]; then
     BUFFER="fg"