Update CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

+
+# Code of Conduct
+This repository is governed by CERN's code of conduct:
+https://hr-dep.web.cern.ch/content/code-of-conduct
+
+__"CERN's values are commitment, professionalism, creativity, diversity and integrity. Taken together they provide the basis for respect: respect for others, respect for the Organization and respect for its mission, and underpin the CERN Code of Conduct."__
+
+# How to report
+If you suspect there have been violations of the above, please contact atlas-software-coordinators (AT) cern.ch