Created PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+## Description
+- Did you add a new feature or did you fixed a bug?
+- Describe your changes in detail
+
+## Related Issue
+- This project only accepts pull requests related to open issues
+- If suggesting a new feature or change, please discuss it in an issue first
+- If fixing a bug, there should be an issue describing it with steps to reproduce
+- Please link to the issue
+
+## Motivation and Context
+- Why is this change required? What problem does it solve?