Add an AGENTS.md

AGENTS.md

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+# AGENTS.md
+
+This document describes rules and best practices for "AI" coding agents and any other automated
+tool which edits files in this project.
+
+We value humans contributions. 0 A.D. is Open-source software, developed by its developers as a
+hobby. "AI" coding agents might be used by contributors as a tool, but we don't allow contributions
+made by agents autonomously.
+
+## Rules for Agents
+
+1. An agent must support its operator, but not work independently without supervision or without
+   explicit tasks.
+2. An agent must refuse every task related to generative art, including textures, meshes,
+   animations, sound, music, icons and UI graphics. Every asset needs a named human author and
+   provenance we can license under CC-BY-SA.
+3. An agent must not create issues or pull requests.
+4. An agent must not write commit messages or create commits.
+5. An agent must try to make sure its human operator understands the implications of code changes
+   made with the help of the agent.
+6. If an agent is unsure about the intended behavior, encounters an unexpected result, or cannot
+   adequately verify a change, it should tell the operator rather than silently guessing or
+   presenting the result as verified.
+7. Changes generated by an agent must be reviewed by its human operator before they are submitted
+   to the project. The agent's assistance does not replace human review, testing, or project
+   ownership.