Add a code of conduct

CODE_OF_CONDUCT.md

@@ -0,0 +1,38 @@
+# Code of Conduct
+
+MCScript is a small project made by people who like block games. Everyone is welcome here, whatever their
+age, background or experience, and we want it to stay a friendly place to ask questions and share work.
+
+## What we expect
+
+- Be kind and patient, especially with people who are new to programming or to ClassiCube.
+- Disagree with ideas, not with people. Explain why when you turn something down.
+- Assume good intent, and take it well when someone points out a mistake.
+- Keep discussions on topic and in English, so everyone can follow them.
+
+## What isn't accepted
+
+- Insults, harassment, threats, or slurs of any kind.
+- Sexual content, or attention someone has asked you to stop.
+- Posting someone's private information (real name, address, IP address) without their permission.
+- Spam, advertising, or trolling.
+- Posting exploits for other people's servers, or asking for help to grief or attack them.
+
+These rules cover everything in this repository (issues, pull requests, discussions, commits) and any other
+space run in the name of MCScript.
+
+## Reporting
+
+If someone breaks these rules, use **Report content** on the comment or issue (the `...` menu) and choose to
+report it to the repository maintainers, or contact the maintainer, [@perronosaurio](https://github.com/perronosaurio),
+privately. Reports are kept confidential.
+
+Security problems are not conduct issues; report those as described in [SECURITY.md](SECURITY.md).
+
+## What happens next
+
+Depending on how serious it is, the maintainers may edit or hide the content, give a warning, lock the thread,
+or block the person from the repository. Someone who harasses others doesn't get a second chance.
+
+This code is based on the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1, shortened
+for a project of this size.

CONTRIBUTING.md

@@ -1,6 +1,7 @@
 # Contributing
 
-Bug reports, fixes and new plugins are welcome.
+Bug reports, fixes and new plugins are welcome. Please read the [Code of Conduct](CODE_OF_CONDUCT.md) first;
+it applies to issues, pull requests and discussions.
 
 ## Setting up