License missing in the package, should be GPL3+ or compatible

A license is missing for this package. Please see the section **"How to Apply These Terms to Your New Programs"** after C-h C-c or use this package:

Emacs: `package-header.el` your hjälpsam Package Header Assistant
https://hyperscope.link/3/7/7/3/0/Your-hjälpsam-Package-Header-Assistant-37730.html

Start by reviewing the package metadata and the package-header.el guidance linked in the issue, including the “How to Apply These Terms to Your New Programs” section. The work is done when the package includes a GPL3+ or compatible license declaration.

Written by the indexing model from the issue text.