Adopt OCaml's code of conduct

Author: xvw

Diff for: CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+This project has adopted the [OCaml Code of Conduct](https://github.com/ocaml/code-of-conduct/blob/main/CODE_OF_CONDUCT.md).
+
+# Enforcement
+
+This project follows the OCaml Code of Conduct
+[enforcement policy](https://github.com/ocaml/code-of-conduct/blob/main/CODE_OF_CONDUCT.md#enforcement).
+To report any violations, please contact:
+
+- Sonja Heinze <sonja [at] tarides [dot] com>
+- Ulysse Gérard <ulysse [at] tarides [dot] com>
+- Pizie Dust <pizie [at] tarides [dot] com>
+- Xavier Van de Woestyne <xavier [at] tarides [dot] com>