Add extracted source directory and README navigation

extracted-source/node_modules/@azure/msal-common/dist/utils/ClientAssertionUtils.mjs

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+/*! @azure/msal-common v15.13.1 2025-10-29 */
+'use strict';
+/*
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License.
+ */
+async function getClientAssertion(clientAssertion, clientId, tokenEndpoint) {
+    if (typeof clientAssertion === "string") {
+        return clientAssertion;
+    }
+    else {
+        const config = {
+            clientId: clientId,
+            tokenEndpoint: tokenEndpoint,
+        };
+        return clientAssertion(config);
+    }
+}
+
+export { getClientAssertion };
+//# sourceMappingURL=ClientAssertionUtils.mjs.map