chore: Move code of conduct to decorum, use Ruby's Community Conduct Guideline

Author: tony

CODE_OF_CONDUCT.md

@@ -22,3 +22,14 @@ Please note we have a code of conduct, please follow it in all your interactions
    Pull Request would represent. The versioning scheme we use is [SemVer](http://semver.org/).
 7. You may merge the Pull Request in once you have the sign-off of one other developer. If you 
    do not have permission to do that, you may request reviewer to merge it for you.
+
+## Decorum
+
+- Participants will be tolerant of opposing views.
+- Participants must ensure that their language and actions are free of personal
+  attacks and disparaging personal remarks.
+- When interpreting the words and actions of others, participants should always
+  assume good intentions.
+- Behaviour which can be reasonably considered harassment will not be tolerated.
+
+Based on [Ruby's Community Conduct Guideline](https://www.ruby-lang.org/en/conduct/)