Create pull_request_template.md

.github/pull_request_template.md

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+## :scroll: Description
+<!--- Describe your changes in detail -->
+
+
+## :bulb: Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+
+## :green_heart: How did you test it?
+
+
+## :pencil: Checklist
+<!--- Put an `x` in the boxes that apply -->
+- [ ] I reviewed submitted code
+- [ ] I added tests to verify changes
+- [ ] I updated the docs if needed
+- [ ] All tests passing
+- [ ] No breaking changes
+
+
+## :crystal_ball: Next steps