improved vim config

.config/nvim/init.vim

@@ -14,12 +14,27 @@
 " Set color for dark backgrounds
 :set background=dark
 
+" Line number
+:set number
+
 " tabstop
 set tabstop=4
 set shiftwidth=4
 
+" Start NERDTree when Vim is started without file arguments.
+autocmd StdinReadPre * let s:std_in=1
+autocmd VimEnter * if argc() == 0 && !exists('s:std_in') | NERDTree | endif
+
+let g:airline#extensions#tabline#enabled = 1
+let g:airline_powerline_fonts = 1
+
 call plug#begin('~/.config/nvim/plugged')
 
 Plug 'neoclide/coc.nvim', {'branch': 'release'}
+Plug 'preservim/nerdtree'
+Plug 'ryanoasis/vim-devicons'
+Plug 'vim-airline/vim-airline'
 
 call plug#end()
+
+nnoremap <C-b> :NERDTreeToggle<CR>