Add Code of Conduct from Contributors Covenant
Add Code of Conduct from Contributors Covenant

open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,Eva-xiaohui-luo/opa,tsandall/opa,Eva-xiaohui-luo/opa,tsandall/opa,tsandall/opa,Eva-xiaohui-luo/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,open-policy-agent/opa,tsandall/opa