Add notes on resubmission

cran-comments.md

@@ -1,3 +1,36 @@
+## Resubmission notes
+
+Thank you to Martina Schmirl for the helpful comments on our initial
+submission. We have improved the documentation and are resubmitting.
+
+"Please always write package names, software names and API names in
+single quotes in title and description. e.g: --> 'vegan'"
+
+Done.
+
+"If there are references describing the methods in your package, please
+add these in the description field of your DESCRIPTION file in the form..."
+
+Thank you, we have no such references.
+
+"Please add \value to .Rd files regarding exported methods and explain
+the functions results in the documentation.
+e.g. kullback_leibler_divergence.Rd"
+
+We have added \value{} to all exported functions.
+
+"In some functions the return value is NaN, however, it would be better
+to use stop() as it "stops execution of the current expression and
+executes an error action.". e.g. kullback_leibler_divergence.Rd
+Please change the code (or mention it in \value{} in the documentation)."
+
+We have carefully considered whether to use stop() in various edge cases.
+We call stop() when the type of input is not correct or when the input size is
+wrong, for example in match_to_tree() and minkowski(). However, for many of
+the functions here, the result is undefined even though the input is
+considered valid. In this case, we return NaN and have documented it in
+\value{}.
+
 ## Test environments
 * local OS X install, R 3.6.1
 * ubuntu 14.04 (on travis-ci), R 3.6.1