Add "reuse" copyright and license templates

From the [_reuse_ documentation](https://reuse.readthedocs.io/en/stable/usage.html "Use the Docs for reuse"), it appears that having a template for copyright and license information which can be used by the _reuse_ tool to apply the correct format and standard headers to files.

With information on how to use the _reuse_ tool when using the cookie-cutter template, this could go at least part of the way to helping resolve, long term, issue #99 for this and other repositories.

Start with the REUSE usage documentation linked in the issue and inspect how the cookie-cutter template is structured. Add copyright and license templates that REUSE can apply, along with instructions for using the REUSE tool with the cookie-cutter template; confirm the result addresses the long-term concern in issue #99.

Written by the indexing model from the issue text.