Add PR template (#5)

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Link a related issue to this PR. If the PR does not immediately resolve the issue,
+for example, it requires a separate deployment to production, avoid
+using the "Fixes" keyword and use "Related to" instead.
+-->
+
+Related to #
+
+## Proposed Changes
+
+*
+
+## Testing Instructions
+
+<!--
+Add as many details as possible to help others reproduce the issue and test the fix.
+"Before / After" screenshots can also be very helpful when the change is visual.
+-->
+
+*
+
+## Pre-merge Checklist
+
+<!--
+Complete applicable items on this checklist **before** merging into trunk. Inapplicable items can be left unchecked.
+
+Both the PR author and reviewer are responsible for ensuring the checklist is completed.
+-->
+
+- [ ] Have you checked for TypeScript, React or other console errors?