Add code of conduct

CODE-OF-CONDUCT.md

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+# Contributor Code of Conduct
+
+KeePassXC is an open project that welcomes everybody no matter their ethnicity, sex,
+sexual identity or orientation, age, socio-economic status, nationality, or religion.
+Irregardless of what background you come from, feel encouraged to participate in
+the project and express your views as long you are respectful to others.
+
+We value all members of our community and so in order to ensure a harassment-free
+experience for everyone and mutual respect among members of this community, we
+impose the following simple rules:
+
+- No bullying, no insults. Any form of harassment will not be tolerated.
+- No racism, no sexism, no homophobia, no hurtful extremist views of any kind.
+- Be mindful of what you say, be diligent in how you say it.
+- Show respect and, as always, be excellent to each other.
+
+Violations of these rules or any other form of abuse can be reported confidentially
+to conduct AT keepassxc DOT org. Members who do not adhere to our code of conduct
+will be banned either permanently or until they change their ways so as to be
+compatible with a friendly, open, and inclusive community.