add chaptertool to README

Author: slhck

README.md

@@ -115,10 +115,12 @@ This program has a simple API that can be used to integrate it into other Python
 
 For more information see the [API documentation](https://htmlpreview.github.io/?https://github.com/slhck/scenecut-extractor/blob/master/docs/scenecut_extractor.html).
 
-## Alternatives
+## Alternatives and Related Tools
 
 For extended scene detection features such as automatic splitting or perceptual hashing, you may want to check out [PySceneDetect](https://pyscenedetect.readthedocs.io/en/latest/).
 
+If you are interested in generating chapters automatically from various media files, have a look at [chaptertool](https://github.com/Mtillmann/chaptertool) (which also uses this library).
+
 ## License
 
 scenecut_extractor, Copyright (c) 2018–2023 Werner Robitza