README.adoc: link developer documentation

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>
swesterfeld · Feb 21, 2024 · e28ffe0 · e28ffe0
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diff --git a/README.adoc b/README.adoc
@@ -23,6 +23,10 @@ later. The algorithm used here is inspired by
   Martin Steinebach: Digitale Wasserzeichen für Audiodaten.
   Darmstadt University of Technology 2004, ISBN 3-8322-2507-2
 
+If you are interested in the details how `audiowmark` works, there is
+a separate
+https://uplex.de/audiowmark/audiowmark-developer.pdf[*documentation for developers*].
+
 == Open Source License
 
 `audiowmark` is *open source* software available under the *GPLv3