chore: import upstream snapshot with attribution

.github/pull_request_template.md

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+## Issue Link / Problem Description
+<!-- Link to related issue or describe the problem this PR solves -->
+- Fixes #[issue_number]
+- OR describe the issue: What problem does this solve? How can it be replicated?
+
+## Changes Made
+<!-- Describe what you changed and why -->
+- 
+- 
+- 
+
+## Testing
+<!-- Describe how this should be tested -->
+### How to Test
+- [ ] Automated tests added/updated
+- [ ] Manual testing steps:
+  1. 
+  2. 
+  3. 
+
+## References
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+- Related issues: 
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+- External references: 
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+## Screenshots/Examples (if applicable)
+<!-- Add screenshots or code examples showing the change -->
+
+---
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+Thank you for contributing to Ragas! 
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