Add LICENSE file

Change-Id: I7dd5f33e252f21ce8b4ce84653a032a2a651e0fa
diff --git a/requirements.txt b/requirements.txt
index e822bda..956c8cf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,9 @@
+#
+# SPDX-FileCopyrightText: 2022-present Intel Corporation
+# SPDX-FileCopyrightText: 2020-present Open Networking Foundation <info@opennetworking.org>
+# SPDX-License-Identifier: Apache-2.0
+#
+
 certifi==2021.10.8
 charset-normalizer==2.0.8
 click==8.0.1