docs: Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+# How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes
+
+- [ ] Test A
+- [ ] Test B
+
+# Relevant notes
+
+Notes about your pull request that may be useful for the reviewer