Add extracted source directory and README navigation

extracted-source/node_modules/gopd/gOPD.js

@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./gOPD')} */
+module.exports = Object.getOwnPropertyDescriptor;

extracted-source/node_modules/gopd/index.js

@@ -0,0 +1,15 @@
+'use strict';
+
+/** @type {import('.')} */
+var $gOPD = require('./gOPD');
+
+if ($gOPD) {
+	try {
+		$gOPD([], 'length');
+	} catch (e) {
+		// IE 8 has a broken gOPD
+		$gOPD = null;
+	}
+}
+
+module.exports = $gOPD;