docs: add contribution guidelines, PR and issue templates

.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: ''
+---
+
+## Bug Description
+
+<!-- A clear and concise description of what the bug is -->
+
+## Steps to Reproduce
+
+1. 
+2. 
+3. 
+4. 
+
+## Expected Behavior
+
+<!-- What you expected to happen -->
+
+## Actual Behavior
+
+<!-- What actually happened -->
+
+## Screenshots
+
+<!-- If applicable, add screenshots to help explain your problem -->
+
+## Environment
+
+- **OS**: [e.g., macOS 14.0, Windows 11, Ubuntu 22.04]
+- **Flutter Version**: [e.g., 3.19.0]
+- **Dart Version**: [e.g., 3.3.0]
+- **Package Version**: [e.g., 1.0.0]
+- **Platform**: [e.g., Web, iOS, Android, macOS, Windows, Linux]
+
+## Logs
+
+<!-- If applicable, paste relevant logs or error messages -->
+
+```
+Paste logs here
+```
+
+## Additional Context
+
+<!-- Add any other context about the problem here -->
+
+## Possible Solution
+
+<!-- If you have suggestions on how to fix the bug -->
+

.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: ''
+---
+
+## Feature Description
+
+<!-- A clear and concise description of the feature you'd like -->
+
+## Problem Statement
+
+<!-- Is this related to a problem? Describe it here -->
+<!-- Example: "I'm always frustrated when..." -->
+
+## Proposed Solution
+
+<!-- A clear description of what you want to happen -->
+
+## Alternatives Considered
+
+<!-- Any alternative solutions or features you've considered -->
+
+## Use Cases
+
+<!-- Describe specific use cases for this feature -->
+
+1. 
+2. 
+3. 
+
+## Additional Context
+
+<!-- Add any other context, mockups, or screenshots about the feature request -->
+
+## Implementation Notes
+
+<!-- If you have technical suggestions for implementation -->
+
+## Would you be willing to contribute this feature?
+
+- [ ] Yes, I'd like to work on this
+- [ ] I could help with testing/review
+- [ ] No, just suggesting
+

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+<!-- Brief description of the changes in this PR -->
+
+## Related Issues
+
+<!-- Link to related issues: "Closes #123" or "Relates to #456" -->
+
+## Changes Made
+
+<!-- List the key changes made in this PR -->
+- 
+- 
+- 
+
+## Type of Change
+
+<!-- Mark the relevant option with an "x" -->
+- [ ] 🐛 Bug fix (non-breaking change that fixes an issue)
+- [ ] ✨ New feature (non-breaking change that adds functionality)
+- [ ] 💥 Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] 📚 Documentation update
+- [ ] 🔧 Refactoring (no functional changes)
+- [ ] 🧪 Test updates
+- [ ] 🏗️ Build/CI changes
+
+## Testing
+
+<!-- Describe how you tested your changes -->
+
+### Test Checklist
+- [ ] Unit tests pass (`flutter test`)
+- [ ] Integration tests pass (if applicable)
+- [ ] Manual testing completed
+- [ ] Analyzer passes (`flutter analyze`)
+- [ ] Code formatted (`dart format .`)
+
+### Testing Instructions
+
+<!-- Steps for reviewers to test the changes -->
+1. 
+2. 
+3. 
+
+## Screenshots (if applicable)
+
+<!-- Add screenshots for UI changes -->
+
+## Additional Notes
+
+<!-- Any additional context or information -->
+
+---
+
+### Reviewer Checklist
+- [ ] Code follows project conventions
+- [ ] Changes are well-documented
+- [ ] Tests adequately cover the changes
+- [ ] No unnecessary changes included
+