[REUSE] Including files without license

[Nico Rikken]

Hello Korrat,

Thanks for using REUSE. The answer was already defined in the FAQ, so
I'm happy to link it: https://reuse.software/faq/#custom-license

So in summary:

# SPDX-License-Identifier: LicenseRef-MyLicense
# SPDX-FileCopyrightText: 2017 Jane Doe <jane at example.com>

Or to be more explicit:

# SPDX-License-Identifier: LicenseRef-NoLicense
# SPDX-FileCopyrightText: 2022 Korrat

There is some ongoing discussion in the SPDX community about best
practices of annotating it:
https://github.com/spdx/spdx-spec/issues/49

Best,
Nico