Code of conduct
Solium adopts the Contributor Covenant, version 2.1 as its code of conduct. It applies in every project space — issues, pull requests, discussions, reviews — and when someone represents the project elsewhere.
The full text is at that address and is not copied here. In short: be respectful, assume good faith, accept criticism of your work gracefully, and do not harass anyone.
Reporting
If someone’s behaviour breaks the code of conduct, tell the maintainer, @IlyaKotomin on GitHub. For anything you do not want to say in public, open an issue asking for a private contact, without details, and the maintainer will reply with one. Reports are handled confidentially, and the enforcement guidelines in the Covenant are the ones followed.