Add extracted source directory and README navigation

extracted-source/node_modules/@azure/identity/dist/esm/util/subscriptionUtils.js

@@ -0,0 +1,14 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+import { formatError } from "./logging.js";
+/**
+ * @internal
+ */
+export function checkSubscription(logger, subscription) {
+    if (!subscription.match(/^[0-9a-zA-Z-._ ]+$/)) {
+        const error = new Error("Invalid subscription provided. You can locate your subscription by following the instructions listed here: https://learn.microsoft.com/azure/azure-portal/get-subscription-tenant-id.");
+        logger.info(formatError("", error));
+        throw error;
+    }
+}
+//# sourceMappingURL=subscriptionUtils.js.map