Add extracted source directory and README navigation

extracted-source/node_modules/lodash-es/_root.js

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+import freeGlobal from './_freeGlobal.js';
+
+/** Detect free variable `self`. */
+var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
+
+/** Used as a reference to the global object. */
+var root = freeGlobal || freeSelf || Function('return this')();
+
+export default root;