Document import statements

Author: dfabulich

commonjs-extension-resolution-loader/README.md

@@ -4,7 +4,14 @@ of file extensions and the ability to import directories that have an index
 file.
 
 Use this loader to enable automatic extension resolution and importing from
-directories that include an index file.
+directories that include an index file, like this:
+
+```js
+import file from './file'; // Where ./file is ./file.js or ./file.mjs
+import index from './folder'; // Where ./folder is ./folder/index.js or ./folder/index.mjs
+```
+
+This loader also applies these automatic resolution rules to the program entry point passed to `node` on the command line:
 
 ```console
 $ node index.mjs