Add new file: CONTRIBUTING, containing a section on AI-generated code

CONTRIBUTING.md

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+# Contributing
+
+The LibResilient project welcomes contributions.
+
+Best way to start is to deploy a testing deployment (for example using the `python3 -m http.server` method) and start testing things out to understand the code.
+
+Bug reports are welcome as new issues. Code contributions are welcome as merge requests.
+
+The project does not require a [CLA](https://en.wikipedia.org/wiki/Contributor_License_Agreement) of any sort. All contributed code will be published under the AGPLv3 license, along with the rest of the project.
+
+## AI-generated code
+
+**The LibResilient project does not accept any kind of AI-generated code**.
+
+By contributing code to LibResilient you acknowledge the above and certify that the code you are contributing has not been generated in any part with help of any AI-based code generation tool (for example, GitHub Copilot).
+
+Contributions that are based on AI-generated code will be rejected outright, and Contributors who submit them will be banned from the project.