Add extracted source directory and README navigation

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

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+import baseGet from './_baseGet.js';
+
+/**
+ * A specialized version of `baseProperty` which supports deep paths.
+ *
+ * @private
+ * @param {Array|string} path The path of the property to get.
+ * @returns {Function} Returns the new accessor function.
+ */
+function basePropertyDeep(path) {
+  return function(object) {
+    return baseGet(object, path);
+  };
+}
+
+export default basePropertyDeep;