Add Source Original vimrc When Using Neovim as a vim til

vim/source-original-vimrc-when-using-neovim.md

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+# Source Original vimrc When Using Neovim
+
+If you install [Neovim](https://neovim.io/) and open up a new `nvim` session,
+you might notice that none of your carefully crafted `~/.vimrc` configuration
+is taking effect.
+
+This is because the `~/.vimrc` file is not part of Neovim's default
+`runtimepath` (see `:h runtimepath` for details on what is included).
+
+For custom user-land configuration of your Neovim sessions, you should start
+with an `init.vim` file. For Mac users, it will likely be placed in
+`~/.config/nvim/`. To be sure where it belongs, you can run `:echo
+stdpath('config')`.
+
+In that file, you can add any Neovim-specific configuration. You can also take
+the opportunity to source your `~/.vimrc` file so that you get all those
+configurations. These lines will do the trick.
+
+```vimrc
+if filereadable(expand('~/.vimrc'))
+  source ~/.vimrc
+endif
+```
+
+Things tend to be backward compatible, so you aren't likely to run into issues
+with what's in your `~/.vimrc`. At any rate, it is a good starting point for
+getting back to a familiar configuration.
+
+See `:h nvim` for more details about how to transition.