add basic code of conduct

Jonathan Dahan · Jonathan Dahan · commit 7fa246df97db · 2019-12-28T11:43:45.000-05:00
diff --git a/code_of_conduct.md b/code_of_conduct.md
@@ -0,0 +1,5 @@
+We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of their differences.
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+We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.
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+If you witness anything that makes you uncomfortable, contact the maintainers of geometry, and we will take appropriate action.
