Create pull_request_template.md

pull_request_template.md

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+# Why
+
+<!--
+ - Describe what prompted you to make the change
+ - It should be a good historical record of the motivations and context of the PR
+-->
+
+# What changed
+
+<!--
+ - Describe what changed to a level of detail that someone with little context with your PR could be able to review it.
+ - People from the future should also be able to read this and understand what's going on.
+ - Annotate changes with a self-review where necessary.
+ - Post a screenshot or video when relevant
+-->
+
+# Test plan
+
+<!-- 
+ - Test plans should allow people without context to run through a list of steps and assert behavior.
+ - If this is a bug fix, the test plan should include steps to reproduce the problem.
+ - If this is a feature, the test plan should reflect a human-readable end-to-end test.
+-->