[AETHER-1752]: Make aether-monitoring repo Member-Only license compliant

Change-Id: I5c17a2d9a1ab11bf871a66b59347d03a3186fb82
diff --git a/slack-notifier/config.json.license b/slack-notifier/config.json.license
new file mode 100644
index 0000000..7dc5f1a
--- /dev/null
+++ b/slack-notifier/config.json.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021 Open Networking Foundation <info@opennetworking.org>
+
+SPDX-License-Identifier: LicenseRef-ONF-Member-Only-1.0
\ No newline at end of file