Merge branch 'addTrainingMaterial' into 'main'

added Pro Git book to training material

See merge request !9

README.md

@@ -21,7 +21,7 @@ _Florian Wörister_ - _Center for Research Data Management_ - florian.woerister[
 | https://swcarpentry.github.io/git-novice/ | A tutorial for people that are new to git |
 | https://learngitbranching.js.org/ | An interactive tutorial on learning the `git`-commands |
 | https://wac-cdn.atlassian.com/dam/jcr:e7e22f25-bba2-4ef1-a197-53f46b6df4a5/SWTM-2088_Atlassian-Git-Cheatsheet.pdf | A cheat sheet for the most common git commands |
-
+| https://git-scm.com/book/en/v2. | Pro Git Book |
 
 ### What is the difference between "git" and "GitLab"?
 When starting to learn about `git`, you might notice that sometimes people talk about `git` and sometimes they use terms like _GitLab_. Aren't they the same thing? The answer is no.