Add a PR template to the cli repo. Roughly using the APi template with some CLI variations (#306)

GitOrigin-RevId: 0767b4554748fce33370b304a577d0d3871d10e1

Author: mosslilley

.github/pull_request_template.md

@@ -0,0 +1,19 @@
+## Summary
+
+<!-- High level summary of what this PR fixes or improves -->
+
+## Motivation
+
+<!-- Linear ticket preferred, Slack thread or support ticket okay -->
+
+## How to verify
+
+<!-- How can reviewers test this change? Manual CLI commands, automated tests, etc -->
+
+## Release notes
+
+<!-- One-line description for the changelog, or "N/A" if not user-facing -->
+
+```markdown changelog
+
+```