Create pull_request_template.md (#552)

.github/pull_request_template.md

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+<!-- EDIT THE TITLE FIRST. -->
+
+# Overview
+
+<!-- EDIT HERE:
+Write a brief overview of this change in a few sentences.
+-->
+
+# Details
+
+<!-- EDIT HERE:
+Write a detailed description of this change,
+including backgrounds, approaches, and any other information that are related to this change.
+-->
+
+# References
+
+<!-- EDIT HERE: Put the list of taskboard issues, discussions related to this change. -->
+
+- Foo
+- Bar
+- Baz
+
+# Blocked by
+
+<!-- EDIT HERE IF ANY: Put the list of changes that have to be merged into the repository before merging this change. -->
+
+- NA
+- (or link to PRs)