Add Copyright Headers

Dear @adelrioo ,

We analysed the current code and found that copyright headers were missing in some of the files under Network State Management / netma-nsm-npp. We have produced a Merge Request to show mainly the type of headers we expect when IP Reviewing open source code.

We invite you to check each change because there are some cases in which the addition of the header can create issues, like in files which are input for another process and we are not sure if comments or a header are expected. Please have a look at them.

You'll notice we've assigned ownership to "Universidad Politecnica de Madrid", as you indicated (I had to remove the accent as the tool I use didn't accept it).

From now on, we expect you can add the copyright headers to each file you develop.

Feel free to be inspired and/or accept the whole Merge Request.

Thanks a lot

cc @mjahn0qp