Add Contributing

Contributing.md

@@ -0,0 +1,34 @@
+# Contributing to Conflux
+
+Thank you for your interest!
+
+## Setup
+
+1. Fork the repository
+2. Clone your fork
+3. Create a feature branch
+4. Submit a pull request
+
+## Building
+
+- JDK 21+
+- Standard Gradle build
+
+## Tests
+
+JUnit tests are included, run:
+
+```bash
+gradle test
+```
+
+## Code Style
+
+* 4-space indentation
+* Clean JavaDoc
+* Tests should print method names and "...ok" at the end
+* Prefer clear, minimal code
+
+---
+
+[[Home]] | [[Changelog]]