Create CONTRIBUTING.md

Author: alperaltuntas

CONTRIBUTING.md

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+# Contributing to visualCaseGen
+
+Thank you for your interest in contributing to visualCaseGen!
+
+We welcome contributions that fix bugs, introduce new features, and enhance the usability, robustness, or performance of the tool. Here's how you can get involved:
+
+## Getting Started
+
+Fork the repository and clone your fork.
+
+Follow the instructions in the visualCaseGen documentation to set up your local visualCaseGen environment: https://esmci.github.io/visualCaseGen/
+
+Create a new branch for your feature or bugfix.
+
+## What You Can Contribute
+
+- Bug fixes and issue resolutions
+- Enhancements to the GUI or core functionality
+- Improved documentation or examples
+- Code cleanup and test coverage
+
+## Guidelines
+
+- Follow the existing code style and structure.
+- Include clear commit messages.
+- Test your changes before submitting.
+- Add tests if you introduce new features.
+- Open a Pull Request with a short summary of your changes.
+- If addressing an open issue, mention it in your PR (e.g., Closes #42).
+
+## Reporting Issues
+
+Please use the GitHub Issues page to report bugs or suggest features. When reporting:
+
+- Include the version of visualCaseGen you used and details about your system environment.
+- Provide clear steps to reproduce the issue.
+- Include screenshots or logs if helpful.