Create pull_request_template.md

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+<!-- One-line summary of the change. -->
+
+Issue #
+
+
+## Rationale
+
+<!-- Please explain what's the motivation, background or reasoning for this, ideally citing any references and describing the impact if not captured well in the linked issue.  -->
+
+
+## Significant changes and points to review
+
+- <!-- Break down some of the focus areas or finer details that reviewers should pay extra attention to. -->
+
+
+## Testing
+
+<!-- Mention any steps, key actions or version breakpoints to verify, ideally aligned with testing you've done yourself to verify the PR functions properly. -->