Mention ids example in Readme

Change-Id: Ifb5d4daf222934dae6d5667f184ff303f8fabeab
diff --git a/README.Rmd b/README.Rmd
index fa3ef8d..c0a9d2c 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -11,6 +11,8 @@
 
 ## Screenshots
 
+Generated from [examples/ids.Rmd](./examples/ids.Rmd).
+
 ![title](https://gitlab.ids-mannheim.de/ids/revealjs/-/jobs/artifacts/main/raw/target/title.png?job=build-job)
 
 ![users](https://gitlab.ids-mannheim.de/ids/revealjs/-/jobs/artifacts/main/raw/target/users.png?job=build-job)