Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+###### Explanation About What Code Achieves:
+<!-- Please explain why this code is necessary / what it does -->
+  - Explanation
+
+###### Steps To Test:
+<!-- What would someone do to be able to see the effects of your code? -->
+  - Steps
+
+###### TODOs:
+<!-- Is there any tests or logic that isn't in the pr that you want the reviewer to know about? -->
+  - None