chore: import upstream snapshot with attribution

.github/pull_request_template.md

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+## Context of Contribution
+
+<!-- Each pull request should fix only one issue or propose one feature. -->
+<!-- Do not mix unrelated changes in a single PR. -->
+
+- [ ] Bug Fix
+- [ ] Refactoring
+- [ ] New Feature
+- [ ] Others
+
+## Summary of the Proposal
+
+<!-- Provide a concise summary of what this pull request proposes. -->
+
+## Reason for the new feature
+
+<!-- If it's a new feature, explain why this feature is necessary. -->
+<!-- Explain how important this feature is to many users. -->
+<!-- Explain if the benefits of the new feature outweigh the maintenance cost. -->
+
+## Checklist
+
+- [ ] I have read the [CONTRIBUTING.md](../blob/main/CONTRIBUTING.md) and agree to follow it.
+- [ ] This PR does not contain commits of multiple contexts.
+- [ ] Code follows proper indentation and naming conventions.
+- [ ] Implemented using only APIs that can be submitted to the Microsoft Store.
+- [ ] Works correctly in both dark theme and light theme.
+- [ ] Works correctly on any device.