Add an AUTHORS.md file to record authors for the repo

[adybbroe]

Feature Request

In the PR template there is a request for the contributor to add his/hers name to the AUTHORS.md file, but such a file is not existing.

Describe the solution you'd like
Please add the file AUTHORS.md to the repo and populate it with the authors which have contibuted so far.

Describe any changes to existing user workflow
Are there any backwards compatibility concerns? Changes to the build process? Additional dependencies?

Additional context
Have you considered any alternative solutions or is there anything else that would help describe your request.