Update README.md

README.md

@@ -4,6 +4,7 @@ This is a project to get started on the gitlab CI for compiling and testing code
 Important links:
 -  Explanations of the YAML syntax of the file **.gitlab-ci.yml** [found here](https://docs.gitlab.com/ce/ci/yaml)
 - Installation of a local runner [found here](https://docs.gitlab.com/runner/install/)
+- commits to not check: add `[CI skip]` in the commit message
 
 ## Tags:
 Tags only make sence if there are multiple runners.