Add extracted source directory and README navigation

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

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+import baseFindIndex from './_baseFindIndex.js';
+import baseIsNaN from './_baseIsNaN.js';
+import strictIndexOf from './_strictIndexOf.js';
+
+/**
+ * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseIndexOf(array, value, fromIndex) {
+  return value === value
+    ? strictIndexOf(array, value, fromIndex)
+    : baseFindIndex(array, baseIsNaN, fromIndex);
+}
+
+export default baseIndexOf;