Add LICENSE file

Change-Id: Ie614dcd034c8bb7d2e7dea20e8fe95bd5bfcf0cb
diff --git a/docker/Dockerfile b/docker/Dockerfile
index b99bbae..dee64fa 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,3 +1,8 @@
+#
+# SPDX-FileCopyrightText: 2022-present Intel Corporation
+# SPDX-FileCopyrightText: 2020-present Open Networking Foundation <info@opennetworking.org>
+# SPDX-License-Identifier: Apache-2.0
+#
 FROM ubuntu:18.04
 ADD . /
 RUN set -xe \