Update license references

Patch set 2: Additional licensing.
Patch set 4: Review licensing.

Issue-ID: NONRTRIC-779
Change-Id: I9f7b5ff7af3af84c8673d843d49deb2d27dc9e1f
Signed-off-by: halil.cakal <halil.cakal@est.tech>
diff --git a/docs/conf.py b/docs/conf.py
index 66c7edf..adbae5d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,3 +1,20 @@
+#  ============LICENSE_START===============================================
+#  Copyright (C) 2021-2022 Nordix Foundation. All rights reserved.
+#  ========================================================================
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#  ============LICENSE_END=================================================
+#
+
 from docs_conf.conf import *
 
 #branch configuration