add plugin manager to ais (add/ls/rm)

.vimrc

@@ -33,6 +33,13 @@ inoremap <C-j> <Esc>
 nnoremap Q :q!<CR>
 vnoremap v V
 
+" load plugins from ~/.vim/plugged/
+for s:dir in glob('~/.vim/plugged/*', 0, 1)
+  if isdirectory(s:dir)
+    exe 'set rtp+=' . s:dir
+  endif
+endfor
+
 syntax on
 filetype plugin indent on
 au BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$") | exe "normal! g`\"" | endif