vim: add vim-commentary

vimrc

@@ -29,6 +29,7 @@ call plug#begin('~/.vim/plugged')
     " Plug 'Valloric/YouCompleteMe'
 
     Plug 'dense-analysis/ale'
+    Plug 'tpope/vim-commentary'
 
     Plug 'posva/vim-vue'
     Plug 'ap/vim-css-color'
@@ -149,6 +150,7 @@ augroup cprog
   " simulate C++ comments (sort of) and provide a means to uncomment easily
   map //		^i/* <ESC>$a */<ESC>
   map \\		bhh/ *[*][/]<CR>d/[/]<CR>x?[/][*]<CR>dw
+  " map //        0v$gc
   call TabSize(4)
 augroup END