Create pull_request_template.md (#511)

Author: deniseyu

.github/pull_request_template.md

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+## Related Issue
+
+Fixes # <!-- INSERT ISSUE NUMBER -->
+
+## Description
+
+In plain English, describe your approach to addressing the issue linked above. For example, if you made a particular design decision, let us know why you chose this path instead of another solution.
+
+<!-- heimdall_github_prtemplate:grc-pci_dss-2024-01-05 -->
+## Rollback Plan
+
+- [ ] If a change needs to be reverted, we will roll out an update to the code within 7 days.
+
+## Changes to Security Controls
+
+Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.