Introduce Pull Request Template

Signed-off-by: Alexander Greene <greene.al1991@gmail.com>

Author: awgreene

.github/workflows/pull_request_template.md

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+# Description
+
+Thank you for your contribution!
+
+Please provide a summary of the changes and the motivation behind the change.
+
+## Reviewer Checklist
+
+- [ ] API Go Documentation
+- [ ] Unit Tests and/or E2E Tests
+- [ ] Comprehensive Commit Messages