Create PULL_REQUEST_TEMPLATE.md

Author: cmaughan

PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the change and which issue is fixed or added 
+Please also include relevant motivation and context.
+
+Fixes # (issue)
+
+## 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)
+- [ ] This change requires a documentation update
+
+**Test Configuration**:
+* OS:
+
+# Checklist:
+
+- [ ] My code has been formatted with the clang format file
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Qt and ImGui demo projects function correctly