Initial minecraft role

Paper/Java via itzg/minecraft-server in docker compose; whitelist and ops synchronized from Ansible, RCON on localhost only, explicit EULA flag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

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+# cloud-minecraft
+
+Ansible role to setup a Minecraft Java Edition server (Paper by default) via docker compose,
+based on the `itzg/minecraft-server` image.
+
+- the game port is public, RCON listens on `127.0.0.1` only
+- whitelist and operators are managed from Ansible (`minecraft_whitelist`, `minecraft_ops`);
+  the whitelist is enforced and synchronized on every start
+- `minecraft_eula` must be set to `true` explicitly (Minecraft EULA: https://aka.ms/MinecraftEULA)
+- world data lives in `minecraft_data_location`; for a consistent backup run
+  `rcon-cli save-off` and `rcon-cli save-all flush` before copying, `rcon-cli save-on` afterwards