Adds working-set.vim external plugin

Author: coderifous

vim/plugins

@@ -53,6 +53,7 @@ plugins=(
   https://github.com/jelera/vim-javascript-syntax.git
   https://github.com/nanotech/jellybeans.vim.git
   https://github.com/coderifous/textobj-word-column.vim.git
+  https://github.com/coderifous/working-set.vim.git
   https://github.com/majutsushi/tagbar.git
   https://github.com/junegunn/fzf.vim.git
   https://github.com/slim-template/vim-slim.git