add pr template

.github/pull_request_template.md

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+## What does this PR do?
+
+<!-- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. -->
+
+- Fixes #XXXX (GitHub issue number)
+
+## Visual Demo
+
+A visual demonstration is strongly recommended, for both the original and new change **(video / image)**.
+
+#### Video Demo (if applicable):
+
+- Show screen recordings of the issue or feature.
+- Demonstrate how to reproduce the issue, the behavior before and after the change.
+
+#### Image Demo (if applicable):
+
+- Add side-by-side screenshots of the original and updated change.
+- Highlight any significant change(s).
+
+## AI Assistance (Required)
+
+We allow AI-assisted development, but reviewers need transparency to assess risk, maintainability, and correctness.
+
+#### AI usage level (check one)
+
+- [ ] None (no AI used)
+- [ ] Light (spellcheck/rewording/comments/docs only)
+- [ ] Medium (AI suggested small code changes/snippets that I adapted)
+- [ ] Heavy (AI significantly shaped the implementation or architecture)
+
+#### Which tool(s) where used?
+
+- e.g., ChatGPT, Copilot, Cursor, etc.
+
+## What was verified by the author?
+
+<!-- Add what you personally checked to ensure correctness and safety. -->
+
+- [ ] I reviewed **and** understood all AI/human generated code
+- [ ] I validated behavior locally (tests/manual verification)
+- [ ] I checked edge cases and failure modes
+
+## Submission Acknowledgement
+
+- [ ] I acknowledge that a decent size PR without self-review might be rejected