(chore): New PR template

.github/pull_request_template.md

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+### Description
+
+Please provide a brief description of the changes in this PR. Include any relevant context or background information.
+
+- **What**: Clearly and concisely describe what changes you have made.
+- **Why**: Explain the reasoning behind these changes. What problem are you solving? Why is this change necessary?
+- **How**: Describe how you implemented these changes. Provide an overview of the approach and any important implementation details.
+
+### Changes Made
+
+- **Added**: List new features or files added.
+- **Modified**: Describe existing features or files modified.
+- **Removed**: Detail features or files that were removed.
+
+### Related Issues
+
+Link to any related issues or discussions. Use keywords like "Fixes", "Resolves", or "Closes" to link to issues automatically.
+
+- Fixes #
+- Resolves #
+- Closes #
+
+### Breaking changes
+
+Describe any breaking change.
+
+
+### Additional Notes and Examples
+
+Include any additional notes or context that reviewers should be aware of, including snippets of code illustrating your new feature.
+
+---
+
+**Please ensure your PR meets the following requirements:**
+
+- [ ] Code builds and passes tests locally, including doctests
+- [ ] New tests have been added (for bug fixes/features)
+- [ ] Pre-commit passes
+- [ ] PR to the documentation exists (for bug fixes / features)