Add section to doclicense what license to use and REUSE spec

Related to: #72

doclicense/doclicense.dtx

@@ -173,6 +173,26 @@ corresponds to \PackageName\nobreakspace\fileversion, dated \printdateTeX{\filed
 % image of the license.  Currently, only \doclicenseLongType is supported but this
 % package is designed to handle all kinds of licenses. See \nameref{sec:contributing}.
 %
+% \section{What license to choose for the document?}
+%
+% The list of available licenses is long (see
+% \href{https://spdx.org/licenses/}{SPDX License List}). Only a (small) subset
+% of them are a good choice for documentation. The \doclicenseLongType family
+% seem to be a common choice as contributions to this package have shown. This
+% package was translated to 15+ languages but no other license families have
+% been added yet. With that, a link to
+% \href{https://creativecommons.org/choose/}{Creative Commons: Choose a
+% License} is probably justified if you have not done that already.
+%
+% That clarifies the question under which license you want to put the document
+% under, but in practice it might not be as easy as that.
+% Under what license are the artifact (image/figure/table/source code listing)
+% you are including? If you created them yourself the answer is easy. If not,
+% it would probably be useful to track such metadata along with the files.
+% For this, the \href{REUSE Specificatio}{https://reuse.software/} can be used.
+% \PackageName{} might integrate with the REUSE Specification to automate
+% proper attribution of artifacts at a later point.
+%
 % \section{Usage}
 % Just load the package by placing something like this:
 %