chore: add GitHub issue and PR templates

Author: Coding-Dev-Tools

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug to help us improve
+title: "[BUG] "
+labels: bug
+assignees: ""
+---
+
+**Describe the Bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Run command '...'
+2. With input '...'
+3. See error
+
+**Expected Behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment (please complete):**
+- OS: [e.g. Ubuntu 22.04, macOS 14, Windows 11]
+- Python version: [e.g. 3.10, 3.12]
+- deadcode version: [e.g. 0.1.1]
+
+**Additional Context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project
+title: "[FEATURE] "
+labels: enhancement
+assignees: ""
+---
+
+**Is your feature request related to a problem?**
+A clear and concise description of what the problem is.
+
+**Describe the Solution**
+A clear and concise description of what you want to happen.
+
+**Describe Alternatives**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional Context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Briefly describe the changes in this PR -->
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] CI/CD improvement
+- [ ] Refactoring
+- [ ] Dependency update
+
+## How Has This Been Tested?
+
+- [ ] `pytest tests/ -v` passes
+- [ ] `ruff check .` passes
+
+## Checklist
+
+- [ ] My code follows the project's style guidelines
+- [ ] I have added tests that prove my fix/feature works
+- [ ] All existing tests pass
+- [ ] I have updated documentation as needed
+
+## Related Issues
+
+<!-- Link to any related issues: Fixes #123, Closes #456 -->