Make babel-node a standalone package (#6023)

* Make babel-node a standalone package

* New package `babel-node` previously `babel-cli/bin/babel-node`

* updates

packages/babel-node/README.md

@@ -0,0 +1,17 @@
+# babel-node
+
+> A Babel-powered Node.js CLI
+
+babel-node is a CLI that works exactly the same as the Node.js CLI, with the added benefit of compiling with Babel presets and plugins before running it.
+
+## Install
+
+```sh
+npm install --save-dev babel-node
+```
+
+## Usage
+
+```sh
+babel-node [options] [ -e script | script.js ] [arguments]
+```