build: add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please follow the template so that the reviewers can easily understand what the code changes affect -->
+
+# Summary
+
+Explain the **motivation** for making this change: here are some points to help you:
+
+- What issues does the pull request solve? Please tag them so that they will get automatically closed once PR is merged
+- What is the feature? (if applicable)
+- How did you implement the solution?
+- What areas of the library does it impact?
+
+## Test Plan
+
+Provide **clear steps so another contributor can reproduce the behavior or verify the feature works**.  
+For example:
+
+- Steps to reproduce the bug (if this is a bug fix)
+- Steps to verify the new feature
+- Expected vs actual results
+- Any special conditions or edge cases to test
+
+## Screenshots / Videos
+
+Include any visual proof that helps reviewers understand the change — UI updates, bug reproduction or the result of the fix.
+
+## Compatibility
+
+| OS      | Implemented |
+| ------- | :---------: |
+| iOS     |    ✅❌     |
+| Android |    ✅❌     |