Create pull_request_template.md

.github/pull_request_template.md

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+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 # (issue)
+
+## Type of change
+
+- Content update
+- Bug fix (non-breaking change which fixes an issue)
+- New feature (non-breaking change which adds functionality)
+
+*Please delete options that are not relevant.*
+
+## Checklist:
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have tested the website locally with my changes, and I am sure that it works well on different screen sizes