Create pull request template file (#92)

pull_request_template.md

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+## Describe your changes
+
+## Internal Jira ticket number or external issue link
+
+## Testing procedure/screenshots(if appropriate):
+
+## Checklist before requesting a review
+- [ ] I have performed a self-review of my code
+- [ ] I have formatted my added/modified code to follow pep-8 standards
+- [ ] I have checked suggestions from python linter to make sure code is of good quality.