docs: Update readme.

Author: milesj

README.md

@@ -2,6 +2,19 @@
 
 Node.js, npm, pnpm, and yarn WASM plugins for [proto](https://github.com/moonrepo/proto).
 
+```shell
+proto install node
+```
+
+## Post-install hook
+
+After installation, the version of npm that came bundled with Node.js will also be installed. This
+functionality can be skipped by passing `--no-bundled-npm` during installation.
+
+```shell
+proto install node -- --no-bundled-npm
+```
+
 ## Contributing
 
 Build the plugins: