doc(CONTRIBUTING): Add AI policy

CONTRIBUTING.md

@@ -33,3 +33,17 @@ Here are a few pointers that might help write the code:
 
 Review the [development-documentation](https://gitlab.com/schmiddi-on-mobile/flare/-/tree/master/doc?ref_type=heads) for information on how to compile the project, how the project is structured and other useful information.
 
+## Use of Generative AI
+
+This project does not allow contributions generated by large languages models (LLMs) and chatbots.
+This ban includes, but is not limited to, tools like ChatGPT, Claude, Copilot, DeepSeek, and Devin AI.
+We are taking these steps as precaution due to the potential negative influence of AI generated content on quality, as well as likely copyright violations.
+
+This ban of AI generated content applies to all parts of the projects, including, but not limited to, code, documentation, issues, and artworks.
+An exception applies for purely translating texts for issues and comments to English.
+
+AI tools can be used to answer questions and find information.
+However, we encourage contributors to avoid them in favor of using existing [documentation](/docs) and asking in [our Matrix room](https://matrix.to/#/#flare-signal:matrix.org).
+Since AI generated information is frequently misleading or false, we cannot supply support on anything referencing AI output.
+
+(This section was taken and modified from the [`glycin` contributing guidelines](https://gitlab.gnome.org/GNOME/glycin/-/blob/main/CONTRIBUTING.md?ref_type=heads#use-of-generative-ai).)