Add maintainers and authors

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

hack/generate-authors

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -eu -o pipefail -x
+
+if [ -x "$(command -v greadlink)" ]; then
+	# on macOS, GNU readlink is ava (greadlink) can be installed through brew install coreutils
+	cd "$(dirname "$(greadlink -f "$BASH_SOURCE")")/.."
+else
+	cd "$(dirname "$(readlink -f "$BASH_SOURCE")")/.."
+fi
+
+# see also ".mailmap" for how email addresses and names are deduplicated
+
+{
+	cat <<-'EOH'
+	# This file lists all individuals having contributed content to the repository.
+	# For how it is generated, see `scripts/generate-authors.sh`.
+	EOH
+	echo
+	git log --format='%aN <%aE>' | LC_ALL=C.UTF-8 sort -uf
+} > AUTHORS