Add a pull request template

.github/pull_request_template.md

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+**Asana Task/Github Issue:** <!-- Link to Asana Task/Github Issue -->
+
+## Description
+
+<!--
+  Provide a terse summary of what the change is, detailed descriptions should belong in ship reviews or tech designs
+-->
+
+## Testing Steps
+
+- <!-- Include simple steps on how to check this change is working. Write "N/A" if not applicable. -->
+
+## Checklist
+
+<!--
+  These questions are a friendly reminder to shipping code, if you're uncertain ask the AoR owners.
+  It's also totally appropriate to not check some of these boxes, if they don't apply to your change.
+-->
+*Please tick all that apply:*
+
+- [ ] I have tested this change locally
+- [ ] I have tested this change locally in all supported browsers
+- [ ] This change will be visible to users
+- [ ] I have added automated tests that cover this change
+- [ ] I have ensured the change is gated by config
+- [ ] This change was covered by a ship review
+- [ ] This change was covered by a tech design
+- [ ] Any dependent config has been merged
+