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WIKI/CONTRIBUTING.md

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+Contributing
+
+Thanks for considering contributing! Please follow these guidelines to make the process smooth.
+
+How to contribute
+
+1. Fork the repository and create a feature branch for your change.
+2. Keep changes focused and add tests where appropriate.
+3. Submit a Pull Request with a clear description and the reason for the change.
+
+Coding standards
+
+- Keep functions small and well-documented.
+- Use the existing logging utilities for consistent output.
+- Prefer safe, incremental changes for financial code.
+
+Security and secrets
+
+- Never commit private keys, API keys, or secrets. Use environment variables or a secrets manager.
+- If you accidentally commit secrets, rotate them immediately.