add code of conduct to root of repository

SethTisue · SethTisue · commit f564a80a6744 · 2018-05-02T19:08:14.000+02:00
this is a GitHub standard now, see https://help.github.com/articles/adding-a-code-of-conduct-to-your-project/
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
@@ -0,0 +1 @@
+all repositories in the [scala](https://github.com/scala) and [scalacenter](https://github.com/scalacenter) organizations are covered by the Scala Code of Conduct: https://scala-lang.org/conduct/

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+all repositories in the [scala](https://github.com/scala) and [scalacenter](https://github.com/scalacenter) organizations are covered by the Scala Code of Conduct: https://scala-lang.org/conduct/`