Add code of conduct

CODE-OF-CONDUCT.md

@@ -0,0 +1,20 @@
+# 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.

README.md

@@ -49,6 +49,8 @@ We are always looking for suggestions on how to improve KeePassXC. If you find a
 
 You may directly contribute your own code by submitting a pull request. Please read the [CONTRIBUTING](.github/CONTRIBUTING.md) document for further information.
 
+Contributors are required to adhere to the project's [Code of Conduct](CODE-OF-CONDUCT.md).
+
 ## License
 
 KeePassXC code is licensed under GPL-2 or GPL-3. Additional licensing for third-party files is detailed in [COPYING](./COPYING).