docs: add issue and pull request templates for better contribution workflow

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a report 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 parameters '...'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment:**
+- OS: [e.g. Ubuntu 22.04, macOS 14, Windows 11]
+- Python version: [e.g. 3.12]
+- Netsleuth version: [e.g. 0.1.0]
+- Network type: [e.g. WiFi, Ethernet, Cellular]
+
+**Additional context**
+Add any other context about the problem here.
+
+**Logs**
+```
+Paste relevant log output 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? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Use cases**
+What are the main use cases for this feature? Who will benefit from it?
+
+**Additional context**
+Add any other context, screenshots, or examples about the feature request here.
+
+**Implementation ideas (optional)**
+If you have ideas about how this could be implemented, share them here.

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+# Pull Request Template
+
+## Description
+Please include a summary of the changes and the related issue. Please also include relevant motivation and context.
+
+Fixes # (issue)
+
+## Type of change
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Performance improvement
+- [ ] Code refactoring (no functional changes)
+
+## How Has This Been Tested?
+Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.
+
+- [ ] Test A
+- [ ] Test B
+
+## Checklist:
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Any dependent changes have been merged and published in downstream modules
+- [ ] I have checked my code and corrected any misspellings
+
+## Screenshots (if appropriate):
+
+## Additional context: