chore: update README

README.org

@@ -4,3 +4,14 @@
 * Presentation
 
 The presentation can be found [[https://gitlab.ost.ch/sml-cs/reading-events/1st-reading-event/-/jobs/artifacts/main/file/build/presentation.pdf?job=build][here]].
+
+* Accompanying container
+
+The container was created with
+
+#+begin_src bash
+  archive = $(guix pack -f docker -S /bin=bin -S /lib=lib -S /share=share -m) manifest.scm
+  docker load < $archive
+  docker tag bash-coreutils-git-emacs registry.gitlab.ost.ch:45023/sml-cs/reading-events/1st-reading-event
+  docker push registry.gitlab.ost.ch:45023/sml-cs/reading-events/1st-reading-event
+#+end_src