Add GitHub pull request template

- Create comprehensive PR template with sections for description, type of change, testing
- Include checklists for code quality, functionality, and performance
- Add sections for database changes, documentation updates, and deployment notes
- Provide emoji icons for better visual organization
- Include related issues linking and screenshot sections

.github/pull_request_template.md

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+## 📋 Description
+
+<!-- Provide a brief description of the changes introduced by this PR -->
+
+## 🔄 Type of Change
+
+<!-- Mark the relevant option with an [x] -->
+
+- [ ] 🐛 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
+- [ ] 🔧 Refactoring (no functional changes, no api changes)
+- [ ] 🧪 Tests (adding missing tests or correcting existing tests)
+- [ ] 🎨 Style changes (formatting, missing semi colons, etc; no code changes)
+- [ ] ⚡ Performance improvements
+- [ ] 🔒 Security improvements
+
+## 🧪 Testing
+
+<!-- Describe the tests that you ran to verify your changes -->
+
+### Manual Testing
+- [ ] Tested API endpoints manually
+- [ ] Verified database operations work correctly
+- [ ] Checked error handling scenarios
+- [ ] Tested with different data inputs
+
+### Automated Testing
+- [ ] All existing tests pass
+- [ ] Added new tests for new functionality
+- [ ] Updated tests for modified functionality
+
+## 📊 Database Changes
+
+<!-- If your changes affect the database, please describe them -->
+
+- [ ] No database changes
+- [ ] New migration created
+- [ ] Migration tested (upgrade/downgrade)
+- [ ] Database schema updated
+
+## 📚 Documentation
+
+<!-- Mark what documentation has been updated -->
+
+- [ ] README.md updated
+- [ ] API documentation updated
+- [ ] Code comments added/updated
+- [ ] CONTRIBUTING.md updated (if needed)
+
+## ✅ Checklist
+
+<!-- Mark completed items with [x] -->
+
+### Code Quality
+- [ ] Code follows the project's coding standards
+- [ ] Self-review of code completed
+- [ ] Code is properly formatted (`ruff format .`)
+- [ ] Linting checks pass (`ruff check .`)
+- [ ] No unused imports or variables
+- [ ] Meaningful variable and function names used
+
+### Functionality
+- [ ] Changes work as expected
+- [ ] No breaking changes (or documented if unavoidable)
+- [ ] Error handling implemented appropriately
+- [ ] Input validation added where necessary
+- [ ] Security considerations addressed
+
+### Performance
+- [ ] No performance regressions introduced
+- [ ] Database queries optimized (if applicable)
+- [ ] Memory usage considered
+
+## 🔗 Related Issues
+
+<!-- Link to the issue(s) this PR addresses -->
+
+Closes #(issue_number)
+Fixes #(issue_number)
+Resolves #(issue_number)
+
+## 📸 Screenshots (if applicable)
+
+<!-- Add screenshots to help explain your changes -->
+
+## 🚀 Deployment Notes
+
+<!-- Any special deployment considerations -->
+
+- [ ] No special deployment steps required
+- [ ] Requires database migration (`alembic upgrade head`)
+- [ ] Requires environment variable updates
+- [ ] Other deployment notes (specify below)
+
+## 🤔 Questions/Concerns
+
+<!-- Any questions or areas where you'd like feedback -->
+
+## 📝 Additional Notes
+
+<!-- Any additional information that reviewers should know -->