ISLANDORA-1698 - update CONTRIBUTING.md

Author: aulorbe

CONTRIBUTING.md

@@ -4,6 +4,8 @@ If you are reading this document then you are interested in contributing to Isla
 
 We also have an irc channel -- #islandora -- on freenode.net. Feel free to hang out there, ask questions, and help others out if you can.
 
+Please note that this project operates under the [Islandora Community Code of Conduct](http://islandora.ca/codeofconduct). By participating in this project you agree to abide by its terms.
+
 ## Workflows
 
 Islandora Committers Calls happen every Thursday at 2PM EST. The meetings are generally held on Skype, and you can join the calls by sending a request to [email protected].