Add git intro

pages/Git.md

@@ -5,3 +5,13 @@ Title:
   * integration to github
   * Documentation on Git & automatic software docs
 ---
+
+KM3NeT uses GitLab as the main platform to develop and discuss software,
+analysis tools, papers and other private or collaborative creations. GitLab
+offers professional and advanced features to keep track of development history
+and allows a rich feature set to exchange thoughts and ideas around them. The
+continuous integration (CI) that is part of the GitLab distribution proves to be
+a powerful automation tool and is utilised to generate consistently up-to-date
+test reports, documentation and software releases in a transparent way.
+
+- docker