Add CoC (#8)

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,7 @@
+# Community Participation Guidelines
+
+This repository is governed by Mozilla's code of conduct and etiquette guidelines. For more details, please read the [Mozilla Community Participation Guidelines](https://www.mozilla.org/about/governance/policies/participation/).
+
+## How to Report
+
+For more information on how to report violations of the Community Participation Guidelines, please read our [How to Report](https://www.mozilla.org/about/governance/policies/participation/reporting/) page.