Add contribution guide

CONTRIBUTING.md

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+# Contribution Guide
+
+We appreciate your interest in contributing! Here’s how you can get involved.
+
+## 🐞 Reporting Issues
+
+### Security Vulnerabilities
+
+If you discover a security issue, please report it promptly via the GitHub ["Report a Vulnerability"][new-security] tab.
+For more details on our security policies, see [SECURITY.md](SECURITY.md).
+
+### Bugs
+
+Found a bug?
+Before opening a new issue, please check the [existing issues][issues] to see if it’s already been reported.
+If it’s a new bug, you can [create an issue here][new-issue].
+
+### Feature Requests
+
+Got an idea for a new feature? We’d love to hear it!
+Please [submit a feature request][new-issue] and provide as much detail as possible.
+
+## 🛠️ Contributing Code
+
+If you’d like to contribute code, follow these steps:
+
+1. **Open an Issue:** Start by [opening an issue][new-issue] to discuss your proposal or bug fix.
+2. **Fork the Repository:** Create a fork and work on your changes in a new branch.
+3. **Submit a Pull Request:** Once your changes are ready, submit a Pull Request (PR) for review.
+
+## 💻 Development Setup
+
+To set up your development environment, ensure you have the following tools installed:
+
+- Go
+- Make
+- Docker
+
+## 🧪 Testing
+
+### Writing Tests
+
+All new code must include unit tests to ensure coverage and stability.
+
+### Running Tests
+
+Run the tests locally with:
+
+```bash
+make test
+```
+
+## 🔍 Code Quality
+
+### Linting
+
+Ensure your code meets project standards by running the linter:
+
+```bash
+make lint
+```
+
+## 🐳 Using Docker for Development
+
+You can use the Docker development environment included in the project.
+To start a shell session inside the container, use:
+
+```bash
+make bash
+```
+
+## 📋 Makefile Commands
+
+To see a list of available `make` commands, run:
+
+```bash
+make help
+```
+
+
+[issues]: https://github.com/nebius/gosdk/issues
+[new-issue]: https://github.com/nebius/gosdk/issues/new/choose
+[new-security]: https://github.com/nebius/gosdk/security/advisories/new

SECURITY.md

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+# Reporting Security Issues
+
+The Nebius team take security bugs seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+To report a security issue, please use the GitHub Security Advisory ["Report a Vulnerability"](https://github.com/nebius/gosdk/security/advisories/new) tab.
+
+The Nebius team will send a response indicating the next steps in handling your report. After the initial reply to your report, the Nebius team will keep you informed of the progress towards a fix and full announcement, and may ask for additional information or guidance.
+
+## Learning More About Security in Nebius
+
+To learn more about security in Nebius, please see [this page](https://nebius.ai/docs/security).