Added pull request template.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_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)
+
+## Related Issue
+Fixes: #.
+
+## Motivation and Context
+(Why is this change required? What problem does it solve?)
+
+## Versioning Changes
+- I read the _Interface Versioning_ section in `README.md`: (yes / no)
+- Interface version was changed: (yes / no)
+- Release version was changed: (yes / no)
+
+## Unit and CI Testing
+- Operating System: (Distro and release)
+- Architectures Tested: (amd64, arm64, armhf, i386, ppc64el, s390x, all, other)
+- I read the _Continuous Integration_ section in `README.md`: (yes / no)
+- Changes introduced new or an alteration to an existing test: (yes / no)
+- All in-tree unit tests pass: (yes / no)
+- All DEP-8 CI tests pass: (yes / no)
+
+## Screenshots: (if appropriate)
+