Merge branch 'main-patch-6d0e' into 'main'

Added DOI & TOC to README

See merge request !12

README.md

 # git-for-beginners
 
-Training material for the Git for Beginners ABiMS training session
+Training material for the Git for Beginners ABiMS training session. Releases are referenced with DOI [10.5281/zenodo.10280837](https://zenodo.org/doi/10.5281/zenodo.10280837).
+
+[[_TOC_]]
 
 ## Course Outline