docs: Add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- Provide a brief description of the changes in this PR -->
+
+## Type of Change
+<!-- Mark the relevant option with an 'x' -->
+
+- [ ] Bug fix (non-braking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Code refactoring
+- [ ] Performance improvement
+- [ ] Test addition or update
+- [ ] Build/CI update
+
+## Related Issues
+<!-- Link to related issues using #issue_number -->
+
+Closes #
+
+## Changes Made
+<!-- List the main changes made in this PR -->
+
+-
+-
+-
+
+## Screenshots/Videos
+<!-- If applicable, add screenshots or videos demonstrating the changes -->
+
+### Before
+<!-- Screenshot of before changes -->
+
+### After
+<!-- Screenshot of after the changes -->
+
+## Testing
+<!-- Describe the tests you ran and how to reproduce them -->
+
+### Test Configuration
+- **OS:**
+- **Browser:**
+- **Node version:**
+
+### Test Steps
+1.
+2.
+3.
+
+## Checklist
+<!-- Mark completed items with an 'x' -->
+
+### Code Quality
+- [ ] My code follows the project's style guidelines
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particulary 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
+
+### Testing
+- [ ] I have tested on desktop
+- [ ] I have tested on mobile
+- [ ] I have tested on tablet
+- [ ] I have tested on multiple browseers (Chrome, Firefox, Safari)
+- [ ] All tests pass: `npm test`
+- [ ] TypeScript compiles: `npm run typecheck`
+- [ ] Linting passes: `npm run lit`
+
+### Accessibility
+- [ ] I have tested with a screen reader
+- [ ] All images have alt text
+- [ ] Color contrast meets WCAG AA standards
+- [ ] Keyboard navigation works
+- [ ] Focus indicators are visible
+
+### Responsive Design
+- [ ] Works on mobile (375px width)
+- [ ] Works on tablet (768px width)
+- [ ] Works on desktop (1440px width)
+- [ ] No horizontal scrolling on mobile
+
+### Performance
+- [ ] Images are optimized
+- [ ] No unnecessary re-renders
+- [ ] Bundle size impact is reasonable
+- [ ] Page load time is acceptable
+
+### Security
+- [ ] No sensitive data in code
+- [ ] API keys are in environment variables
+- [ ] Input validation is implemented
+- [ ] SQL injection prevention is in place (if applicable)
+- [ ] XSS prevention is in place
+
+### Documentation
+- [ ] README updated (if needed)
+- [ ] API documentation updated (if needed)
+- [ ] Component props documented (if new component)
+- [ ] CHANGELOG updated (if applicable)
+
+## Additional Notes
+<!-- Add any additional notes for reviewers -->
+
+## For Reviewers
+<!-- What should reviewers focus on? -->
+
+**Focus areas:**
+- 
+- 
+
+**Questions:**
+- 
+- 
+
+---
+
+**Checklist for Reviewers**
+- [ ] Code follows project conventions
+- [ ] Changes are well-tested
+- [ ] Documentation is clear and complete
+- [ ] No obvious security issues
+- [ ] Performance impact is acceptable