Initial project setup: RoadRunner (Multi-loader Stonecutter Template)

README_SETUP.md

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+# RoadRunner Setup Instructions
+
+## Prerequisites
+1. **Java 21 JDK**: You must have Java 21 installed.
+   - Verify with: `java -version`
+2. **IntelliJ IDEA**: Recommended IDE for Kotlin/Minecraft development.
+   - Install the "Minecraft Development" plugin.
+
+## Getting Started
+1. Open this folder in IntelliJ IDEA.
+2. Allow Gradle to sync. This might take a few minutes as it downloads Minecraft and dependencies.
+3. To run the mod:
+   - Open the "Gradle" tab in IntelliJ.
+   - Navigate to `RoadRunner -> Tasks -> architectury -> runClient`.
+   - Or run in terminal: `./gradlew runClient`
+
+## Project Structure
+- `src/main/kotlin`: Main mod logic (Common code)
+- `src/main/java`: Java sources (Mixins)
+- `versions/`: Loader-specific configurations (Fabric/NeoForge)
+- `PLAN.md`: Development roadmap
+
+## Next Steps
+Check `PLAN.md` for the feature roadmap.