Add PR template

.github/pull_request_template.md

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+## Overview
+
+Brief description of what this PR does, and why it is needed.
+
+### Checklist
+
+- [ ] PR has a descriptive enough title to be useful in changelogs
+
+### Demo
+
+Optional. Screenshots, `curl` examples, etc.
+
+### Notes
+
+Optional. Ancillary topics, caveats, alternative strategies that didn't work out, anything else.
+
+
+## Testing Instructions
+
+ * How to test this PR
+ * Prefer bulleted description
+ * Start after checking out this branch
+ * Include any setup required, such as bundling scripts, restarting services, etc.
+ * Include test case, and expected output
+
+Closes #XXX
+