Add CoC

Signed-off-by: Bryan Frimin <bryan@frimin.fr>

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,31 @@
+# Code of Conduct
+
+## Our Promise
+
+We want this project to be welcoming to everyone. We're committed to
+making this a friendly, safe space where you can contribute regardless
+of who you are or your background.
+
+## Expected Behavior
+
+* Be kind and respectful to others
+* Welcome newcomers and help them learn
+* Listen to different viewpoints with an open mind
+* Accept feedback gracefully
+* Focus on what's best for the community
+
+## Unacceptable Behavior
+
+* Harassment or bullying of any kind
+* Offensive comments about others
+* Trolling or insulting others
+* Sharing private information without permission
+* Any form of discrimination
+
+## Enforcement
+
+If you see someone behaving inappropriately, please contact the
+project maintainers at [report at getprobo dot
+com](mailto:report@getprobo.com). We will investigate all complaints
+and respond as we determine necessary. We may temporarily or
+permanently ban contributors who violate these rules.