Add extracted source directory and README navigation

extracted-source/node_modules/axios/lib/helpers/isAxiosError.js

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+'use strict';
+
+import utils from '../utils.js';
+
+/**
+ * Determines whether the payload is an error thrown by Axios
+ *
+ * @param {*} payload The value to test
+ *
+ * @returns {boolean} True if the payload is an error thrown by Axios, otherwise false
+ */
+export default function isAxiosError(payload) {
+  return utils.isObject(payload) && payload.isAxiosError === true;
+}