docs: add PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please use a Conventional Commit in your PR title -->
+<!-- https://conventionalcommits.org -->
+<!-- e.g. "feat: support new field type" -->
+
+**Resolves**: <!-- GitHub or Linear issue (e.g. #123, DT-123) -->
+
+### Description
+
+<!-- Describe your changes in detail. -->
+<!-- Why is this change required? -->
+<!-- What problem does it solve? -->
+
+### Checklist
+
+<!-- Put an `x` in all the boxes that apply. -->
+<!-- Don't hesitate to ask for help! -->
+
+- [ ] If my changes require tests, I added them.
+- [ ] If my changes affect backward compatibility, it has been discussed.
+- [ ] If my changes require an update to the CONTRIBUTING.md guide, I updated it.
+
+### Preview
+
+<!-- If your changes are visual, screenshots or videos are welcome! -->
+
+### How to QA [^1]
+
+<!-- When relevant, describe how to QA your changes. -->
+
+<!-- Your favorite emoji is welcome to close your PR! -->
+
+<!-- A note for reviewers: -->
+
+[^1]:
+	Please use these labels when submitting a review:
+	:question: #ask:&ensp;Ask a question.
+	:bulb: #idea:&ensp;Suggest an idea.
+	:warning: #issue:&ensp;Strongly suggest a change.
+	:tada: #nice:&ensp;Share a compliment.