added markdown preview to vim

.vimrc

@@ -12,11 +12,16 @@ Plugin 'VundleVim/Vundle.vim'
 
 Plugin 'scrooloose/nerdtree'
 
+Plugin 'digitaltoad/vim-pug'
+
 Plugin 'itchyny/lightline.vim'
 
 Plugin 'airblade/vim-gitgutter'
 
 Plugin 'altercation/vim-colors-solarized'
+
+Plugin 'suan/vim-instant-markdown'
+
 " All of your Plugins must be added before the following line
 call vundle#end()            " required
 filetype plugin indent on    " required