Added a pull request template

.github/pull_request_template.md

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+**Requirements**
+
+- [ ] I have added test coverage for new or changed functionality
+- [ ] I have followed the repository's [pull request submission guidelines](../blob/master/CONTRIBUTING.md#submitting-pull-requests)
+- [ ] I have validated my changes against all supported platform versions
+
+**Related issues**
+
+Provide links to any issues in this repository or elsewhere relating to this pull request.
+
+**Describe the solution you've provided**
+
+Provide a clear and concise description of what you expect to happen.
+
+**Describe alternatives you've considered**
+
+Provide a clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+
+Add any other context about the pull request here.