Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+### Describe what this PR does / why we need it
+
+
+### Does this pull request fix one issue?
+
+<!--If that, add "Fixes #xxxx" below in the next line. For example, Fixes #15. Otherwise, add "NONE" -->
+
+### Describe how you did it
+
+
+### Describe how to verify it
+
+
+### Special notes for reviews