Create pull_request_template.md.

.github/pull_request_template.md.

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+# Pull Request Template for MinMochi
+
+## Description
+
+### What does this PR do?
+
+- [ ] Adds new functionality
+- [ ] Fixes a bug
+- [ ] Updates documentation
+- [ ] Improves performance
+- [ ] Refactors code
+
+Please provide a detailed description of what this PR accomplishes and why the changes were made.
+
+---
+
+## Related Issue
+
+<!-- If applicable, link the issue this PR addresses -->
+Fixes #<issue-number>
+
+---
+
+## Changes Summary
+
+### Key Changes:
+1. **Feature/Component Name**:
+   - Short description of change(s).
+2. **Feature/Component Name**:
+   - Short description of change(s).
+
+### Added Dependencies:
+- List any new dependencies (from `requirements.txt` or `pyproject.toml`) and their purpose.
+
+---
+
+## Testing
+
+### Unit Tests:
+- [ ] Added/Updated unit tests.
+- [ ] Tested locally using specific test cases.
+
+### Steps to Test:
+1. Describe how reviewers can test this PR.
+2. Include any relevant sample payloads or commands.
+
+### Expected Behavior:
+- Describe the expected outcome of the changes.
+
+---
+
+## Checklist
+
+- [ ] Code is clean and adheres to project conventions.
+- [ ] Updated relevant documentation (README, comments, etc.).
+- [ ] Ran `pylint`, `black`, or equivalent formatting tools.
+- [ ] Confirmed backward compatibility.
+
+---
+
+## Metrics and Monitoring
+
+### Prometheus:
+- Added/Updated metrics:
+  - Metric name: `<metric_name>` (e.g., `request_processing_time`)
+  - Description: `<description>`
+
+### Logging:
+- [ ] Logs are structured with `loguru`.
+- [ ] Verified logging covers edge cases.
+
+---
+
+## Additional Information
+
+- Notes for the reviewer:
+  - Special considerations (e.g., large changes, experimental features).
+  - Assumptions made in this implementation.
+
+---