Add useful plugins

README.md

@@ -784,6 +784,7 @@ The syntax API is still a work in progress. Here are a couple of pointers:
 - Add stuff about unit tests? I know Neovim uses the [busted](https://olivinelabs.com/busted/) framework, but I don't know how to use it for plugins
 - Best practices? I'm not a Lua wizard so I wouldn't know
 - How to use LuaRocks packages ([wbthomason/packer.nvim](https://github.com/wbthomason/packer.nvim)?)
+- Companion plugins like [bfredl/nvim-luadev](https://github.com/bfredl/nvim-luadev) and [rafcamlet/nvim-luapad](https://github.com/rafcamlet/nvim-luapad)
 
 ## Miscellaneous