Add copyright to new file

zhengyu123 · zhengyu123 · commit eee6fe81df70 · 2026-05-31T18:11:57.000Z
diff --git a/ddprof-lib/src/main/cpp/signalCookie.cpp b/ddprof-lib/src/main/cpp/signalCookie.cpp
@@ -1,3 +1,8 @@
+/*
+ * Copyright 2026, Datadog, Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 #include "signalCookie.h"
 
 namespace SignalCookie {
