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CONTRIBUTING.md

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+# Contributing to OpenGraphKt
+
+Thank you for your interest in contributing to OpenGraphKt! This document provides guidelines and instructions for contributing to the project.
+
+## Development Setup
+
+### Prerequisites
+
+- Java 24 (JVM toolchain)
+- Gradle 8.14.3+ (wrapper included)
+- Git
+
+### Getting Started
+
+1. Clone the repository:
+   ```bash
+   git clone https://github.com/jlengrand/OpenGraphKt.git
+   cd OpenGraphKt
+   ```
+
+2. Build the project:
+   ```bash
+   ./gradlew build
+   ```
+
+3. Run tests:
+   ```bash
+   ./gradlew test
+   ```
+
+4. Check code coverage:
+   ```bash
+   ./gradlew koverXmlReport
+   ./gradlew koverVerify  # Enforces 70% minimum coverage
+   ```
+
+## Project Structure
+
+- `opengraphkt/` - Core library module (published to Maven Central)
+- `demo/` - Local file parsing examples
+- `demo-remote/` - Remote URL parsing examples using published artifact
+- `scrape-test/` - Testing/scraping utilities
+
+## Making Changes
+
+### Code Style
+
+- Follow Kotlin coding conventions
+- Use meaningful variable and function names
+- Add KDoc comments for public APIs
+
+### Testing
+
+- Write tests for all new functionality
+- Maintain minimum 70% code coverage (enforced by Kover)
+- Run tests locally before submitting PR: `./gradlew test`
+
+### Commits
+
+- Write clear, concise commit messages
+- Reference issue numbers when applicable
+- Keep commits focused and atomic
+
+## Submitting Changes
+
+1. Fork the repository
+2. Create a feature branch: `git checkout -b feature/your-feature-name`
+3. Make your changes
+4. Run tests and ensure coverage: `./gradlew test koverVerify`
+5. Commit your changes
+6. Push to your fork
+7. Submit a Pull Request
+
+## Publishing New Versions
+
+This section is for maintainers only.
+
+### Version Numbering
+
+OpenGraphKt follows [Semantic Versioning](https://semver.org/):
+- **MAJOR** version for incompatible API changes
+- **MINOR** version for backwards-compatible functionality additions
+- **PATCH** version for backwards-compatible bug fixes
+
+### Pre-Release Checklist
+
+1. **Update version number** in `opengraphkt/build.gradle.kts`:
+   ```kotlin
+   version = "0.1.3-SNAPSHOT"  // Change to "0.1.3" for release
+   ```
+
+2. **Update demo-remote dependency** in `demo-remote/build.gradle.kts`:
+   ```kotlin
+   dependencies {
+       implementation("fr.lengrand:opengraphkt:0.1.3")  // Match release version
+   }
+   ```
+
+3. **Run full test suite**:
+   ```bash
+   ./gradlew clean build test koverVerify
+   ```
+
+4. **Test demo applications**:
+   ```bash
+   ./gradlew :demo:run
+   ./gradlew :demo-remote:run
+   ```
+
+### Publishing to Maven Central
+
+The project uses the `com.vanniktech.maven.publish` plugin for publishing.
+
+1. **Configure credentials** (first time only):
+   - Set up Sonatype Central Portal account
+   - Configure GPG signing keys
+   - Add credentials to `~/.gradle/gradle.properties`:
+     ```properties
+     mavenCentralUsername=your-username
+     mavenCentralPassword=your-password
+     signing.keyId=your-key-id
+     signing.password=your-key-password
+     signing.secretKeyRingFile=/path/to/secring.gpg
+     ```
+
+2. **Publish to local Maven for testing**:
+   ```bash
+   ./gradlew publishToMavenLocal
+   ```
+
+3. **Publish to Maven Central**:
+   ```bash
+   ./gradlew publishAllPublicationsToMavenCentral
+   ```
+
+4. **Create Git tag and push**:
+   ```bash
+   git tag v0.1.3
+   git push origin v0.1.3
+   ```
+
+5. **Create GitHub release**:
+   - Go to GitHub repository → Releases
+   - Create new release from the tag
+   - Add release notes describing changes
+
+### Post-Release Steps
+
+1. **Bump version to next SNAPSHOT** in `opengraphkt/build.gradle.kts`:
+   ```kotlin
+   version = "0.1.4-SNAPSHOT"
+   ```
+
+2. **Commit version bump**:
+   ```bash
+   git commit -am "Bump version to 0.1.4-SNAPSHOT"
+   git push
+   ```
+
+## Questions?
+
+If you have questions or need help, please:
+- Open an issue on GitHub
+- Check existing issues and discussions
+
+Thank you for contributing to OpenGraphKt!