Add copyright headers
Dear @gnikolaidis @geonikolai ,
We analysed the current code and found that copyright headers were added in some of the source code files, while they were missing in others. 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 "Centre for Research and Technology Hellas (CERTH) / Information Technologies Institute (ITI)", as indicated by Vasilis, and we have added the SPDX identified, which is required as that is the acronym that the automatic tools look for to identify the code's license.
You will notice as well that in each file there is a placeholder for the Contributors (last section in the header). Feel free to add your name and contribution, or other's names there. You can add one line per contributor.
Feel free to be inspired and/or accept the whole Merge Request.
Thanks a lot