Add a pull request template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+
+<!--- What is the purpose of these changes? What problem does it solve? -->
+<!--- If these changes fix an open issue, please link to the issue here. -->
+
+## How have these changes been tested?
+
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment and what tests you ran -->
+<!--- to see how your changes affect 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: -->
+
+- [ ] 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 not work as expected)
+
+## 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! -->
+
+- [ ] My code follows the code style of this project.
+- [ ] My changes require changes to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests pass.