chore(template): add pull request template

.github/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
+<!--- 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, tests ran to see how -->
+<!--- your change affects other areas of the code, etc. -->
+
+## 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)
+- [ ] Documentation (adding or updating documentation)
+
+## 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 change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] These changes should be applied to a maintenance branch.
+- [ ] This change requires cross browser checks.
+- [ ] This change requires a performance test prior to merging.
+- [ ] This change impacts caching.
+- [ ] This change impacts HTTP headers.
+- [ ] This change has new infrastructure requirements.
+- [ ] This change requires additional environment variables.
+- [ ] I have added the Apache 2.0 license to any new files created.
+
+## What is the Impact to Developers Using the App?
+<!--- Please describe how your changes impacts developers using the app. -->