Initial commit: add Minecraft plugin updater

Add Dockerfile, main Python script, example config, requirements, and README for a Dockerized Minecraft plugin updater. The updater supports GitHub, Modrinth, and Spigot plugins, automatically checks for updates, downloads new versions, and manages plugin files and state.

Dockerfile

@@ -0,0 +1,14 @@
+FROM python:3.9-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY main.py .
+
+# Create volume mount points
+# /data should contain config.yaml and will be where plugins are downloaded (in /data/plugins)
+VOLUME /data
+
+CMD ["python", "-u", "main.py"]