feat: Add copyright header

src/ndto_utils.erl

@@ -1,3 +1,16 @@
+%%% Copyright 2023 Nomasystems, S.L. http://www.nomasystems.com
+%%
+%% 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
 -module(ndto_utils).
 
 %%% EXTERNAL EXPORTS