Added PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+*Please complete the relevant sections and remove any that don't apply.*  
+*Remember to delete this instruction before submitting your PR.*
+
+**PR Type**  
+- [ ] Bug fix
+- [ ] Feature
+- [ ] Chore (refactoring, formatting, cleanup, etc.)
+- [ ] Documentation content changes
+- [ ] Localization / Internationalization
+- [ ] Other (please describe): _______
+
+**Describe changes**  
+Please describe the changes you have made.
+
+**What is the current behavior?**  
+Please describe the current behavior that you are modifying, or link to a relevant issue.
+
+**What is the new behavior?**  
+Please describe the new behavior.
+
+**How to test**  
+Describe the steps to test this PR, if applicable.
+
+**Other information**  
+Add any other information here.