feat(add docs):

docs/contributing.md

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+# Contributing
+
+We welcome contributions to Agentic Security! Follow these steps to get started:
+
+## How to Contribute
+
+1. **Fork the Repository**: Click the "Fork" button at the top of the repository page.
+2. **Clone Your Fork**: Clone your forked repository to your local machine.
+   ```bash
+   git clone https://github.com/mmsoedov/agentic_security.git
+   ```
+3. **Create a Branch**: Create a new branch for your feature or bugfix.
+   ```bash
+   git checkout -b feature-name
+   ```
+4. **Make Changes**: Implement your changes and commit them.
+   ```bash
+   git commit -m "Description of changes"
+   ```
+5. **Push Changes**: Push your changes to your fork.
+   ```bash
+   git push origin feature-name
+   ```
+6. **Open a Pull Request**: Go to the original repository and open a pull request.
+
+## Code of Conduct
+
+Please adhere to the [Code of Conduct](CODE_OF_CONDUCT.md) in all interactions.
+
+## Further Reading
+
+For more details on contributing, refer to the [Documentation](index.md) section.