add citation and contributing files

Author: statmlben

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use ReHLine in your research, please cite it as follows:"
+title: "ReHLine: Efficient Solver for ERM with PLQ Loss and Linear Constraints"
+version: 1.0.0
+date-released: 2023-12-01
+url: "https://github.com/softmin/ReHLine"
+repository-code: "https://github.com/softmin/ReHLine-python"
+documentation: "https://rehline-python.readthedocs.io"
+license: MIT
+authors:
+  - family-names: "Dai"
+    given-names: "Ben"
+  - family-names: "Qiu"
+    given-names: "Yixuan"
+keywords:
+  - optimization
+  - machine learning
+  - empirical risk minimization
+  - convex optimization
+  - support vector machines
+  - quantile regression
+preferred-citation:
+  type: conference-paper
+  title: "ReHLine: Regularized Composite ReLU-ReHU Loss Minimization with Linear Computation and Linear Convergence"
+  authors:
+    - family-names: "Dai"
+      given-names: "Ben"
+    - family-names: "Qiu"
+      given-names: "Yixuan"
+  conference:
+    name: "Thirty-seventh Conference on Neural Information Processing Systems"
+  year: 2023
+  url: "https://openreview.net/pdf?id=3pEBW2UPAD"
+ENDOFFILE; __hermes_rc=$?; printf '__HERMES_FENCE_a9f7b3__'; exit $__hermes_rc

CONTRIBUTING.md

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+# Contributing to ReHLine
+
+## Getting Started
+
+1. Fork and clone: `git clone https://github.com/your-username/ReHLine-python.git`
+2. Install: `pip install -e .`
+
+## Making Changes
+
+1. Create a branch for your feature/fix
+2. Add tests for new functionality
+3. Run tests: `pytest tests/ -v`
+4. Submit a pull request
+
+## Reporting Issues
+
+- Bug reports: include steps to reproduce, expected vs actual behavior, and a minimal code example
+- Feature requests: describe the use case and proposed API
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the MIT License.

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.1.x   | :white_check_mark: |
+| < 0.1.0 | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in ReHLine, please report it responsibly:
+
+1. **Do not** open a public issue
+2. Email the maintainers directly at: bendai@cuhk.edu.hk
+3. Include:
+   - Description of the vulnerability
+   - Steps to reproduce
+   - Potential impact
+   - Suggested fix (if any)
+
+## Response Timeline
+
+- **Acknowledgment**: Within 48 hours
+- **Assessment**: Within 1 week
+- **Fix & Release**: As soon as possible, depending on severity
+
+## Security Best Practices
+
+When using ReHLine:
+
+- Keep dependencies up to date
+- Validate input data before passing to solvers
+- Use appropriate constraints to prevent numerical issues
+- Report any unexpected behavior that might indicate a security issue
+ENDOFFILE; __hermes_rc=$?; printf '__HERMES_FENCE_a9f7b3__'; exit $__hermes_rc