Add "reuse" copyright and license templates

[hugodahl]

From the reuse documentation, 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.

[askpatrickw]

Would that work where we have a model of original author of the file and sometimes add the library author but sometimes not... see #103 for a categorization of the way copyright is applied to files.