add vim-plug autoinstall

dot_config/nvim/init.vim

@@ -1,5 +1,12 @@
 set nocompatible
 
+" Automatically install vim plug & plugins
+let data_dir = has('nvim') ? stdpath('data') . '/site' : '~/.vim'
+if empty(glob(data_dir . '/autoload/plug.vim'))
+  silent execute '!curl -fLo '.data_dir.'/autoload/plug.vim --create-dirs  https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'
+  autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
+endif
+
 call plug#begin()
 Plug 'vim-test/vim-test'
 Plug 'tpope/vim-commentary'