Updated tips (markdown)

tips.md

@@ -20,6 +20,25 @@ If you're behind an HTTP proxy and your proxy does not have TLS/SSL certificates
 
 Resort to this only if git cannot get updated certificates or if Github has TLS/SSL issues.
 
+#### Automatic installation of missing plugins
+
+You can even go a step further and make `:PlugInstall` run on startup if there are any missing plugins.
+
+```vim
+" Install vim-plug if not found
+if empty(glob('~/.vim/autoload/plug.vim'))
+  silent !curl -fLo ~/.vim/autoload/plug.vim --create-dirs
+    \ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
+endif
+
+" Run PlugInstall if there are missing plugins
+if len(filter(values(g:plugs), '!isdirectory(v:val.dir)'))
+  autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
+endif
+```
+
+Note that this may increase the startup time of Vim.
+
 ### Install plugins on the command line
 
 ```sh