chore: add pull request template

.github/pull_request_template.md

@@ -0,0 +1,35 @@
+## Description
+
+<!--- Describe your changes in detail -->
+
+## 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. -->
+
+## How Has This Been Tested?
+
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+## Screenshots (if appropriate):
+
+## Types of changes
+
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+
+-   [ ] Chore (a change that does not modify the application functionality)
+-   [ ] Bug fix (non-breaking change which fixes an issue)
+-   [ ] New feature (non-breaking change which adds functionality)
+-   [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+## Checklist:
+
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+
+-   [ ] Documentation updates are needed, and have been made accordingly.
+-   [ ] I have added and/or updated tests to cover my changes.
+-   [ ] All new and existing tests passed.
+-   [ ] My changes include a database migration.