docs: add CODE_OF_CONDUCT, CONTRIBUTING, SECURITY and issue templates

.github/CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our Pledge
+
+We are committed to making participation in this project a harassment-free experience for everyone.
+
+## Our Standards
+
+**Positive behavior:**
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+
+**Unacceptable behavior:**
+- Harassment, insults or derogatory comments
+- Publishing others' private information
+- Any conduct which could reasonably be considered inappropriate
+
+## Enforcement
+
+Violations may be reported to **t.me/kotyarakryt**. All complaints will be reviewed and investigated.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1.

.github/CONTRIBUTING.md

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+# Contributing to SimpleKillFeed
+
+Thank you for your interest in contributing! 🎉
+
+## Getting Started
+
+1. Fork the repository
+2. Create a new branch: `git checkout -b feature/your-feature`
+3. Make your changes
+4. Ensure the project builds: `dotnet build`
+5. Commit: `git commit -m "feat: add your feature"`
+6. Push: `git push origin feature/your-feature`
+7. Open a Pull Request
+
+## Commit Convention
+
+We use conventional commits:
+
+| Prefix | Description |
+|---|---|
+| `feat:` | New feature |
+| `fix:` | Bug fix |
+| `docs:` | Documentation |
+| `chore:` | Maintenance |
+| `refactor:` | Code refactoring |
+
+## Code Style
+
+- Follow existing code style
+- Add XML doc comments to public methods
+- Keep methods small and focused
+
+## Pull Request Requirements
+
+- [ ] Code compiles without errors
+- [ ] Changes are tested
+- [ ] Documentation is updated if needed
+- [ ] PR description clearly explains the changes

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- What does this PR do? Why is it needed? -->
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation update
+- [ ] Refactoring
+- [ ] Performance improvement
+
+## Related Issue
+Closes #
+
+## Changes Made
+<!-- List the specific changes made in this PR -->
+-
+-
+-
+
+## Testing
+<!-- How did you test your changes? -->
+- [ ] Tested on a local CS2 server
+- [ ] Tested with multiple players
+- [ ] Edge cases considered
+
+## Screenshots
+<!-- If applicable, add screenshots or logs -->
+
+## Checklist
+- [ ] Code compiles without errors
+- [ ] I have tested my changes on a CS2 server
+- [ ] I have added/updated XML doc comments
+- [ ] I have followed the code style guidelines
+- [ ] PR title follows conventional commits format (feat/fix/docs/chore)
+- [ ] I have updated README if needed

.github/SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported |
+|---|---|
+| Latest | ✅ |
+| Older  | ❌ |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability, please **do NOT open a public issue**.
+
+Instead, contact us privately:
+- Telegram: **t.me/kotyarakryt**
+
+We will respond within **48 hours** and work to resolve the issue as quickly as possible.
+
+## What to Include
+
+- Description of the vulnerability
+- Steps to reproduce
+- Potential impact
+- Suggested fix (optional)