Add pull request tenplate

Author: ElliottKasoar

.github/PULL_REQUEST_TEMPLATE/new_benchmark.md

@@ -0,0 +1,15 @@
+<!--
+Thank you for contributing! To help us out with reviewing, please consider the following:
+
+- Does this pull request include a summary of the change? (See below.)
+- Does this pull request include a descriptive title?
+- Does this pull request include references to any relevant issues?
+-->
+
+## Summary
+
+<!-- What's the purpose of the change? What does it do, and why? -->
+
+## Test Plan
+
+<!-- How was it tested? -->