Create pull_request_template.md (#9)

.github/pull_request_template.md

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+## Description
+<!--- Describe your changes.  Why is this required?  What problem does it solve?  What functionality does it extend? -->
+
+## Related GitHub Issue
+<!--- Please link to GitHub Issue here: -->
+
+## Testing
+<!--- Please describe, in detail, how you tested your changes. -->
+
+## Screenshot(s):
+<!--- Optional screenshots of changes if relevant and helpful to reviewers -->
+
+## Checklist
+
+- [ ] ✔️ Have you assigned at least one reviewer?
+- [ ] 🔗 Have you referenced any issues this PR will close?
+- [ ] ⬇️ Have you merged the latest upstream changes into your branch? 
+- [ ] 🧪 Have you added tests to cover these changes?  If not, why:
+
+- [ ] 🤖 Have automated checks (if any) passed?  If not, please explain for the reviewer:
+
+- [ ] 📘 Have you updated/added any relevant readmes/comments in the codebase?
+- [ ] 📚 Have you updated/added any external documentation (e.g. Confluence)?