Create pull_request_template.md

Author: sslava

.github/pull_request_template.md

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+
+## Summary
+
+<!--
+ Explain the **motivation** for making this change. What existing problem does the pull request solve?
+-->
+
+## How did you test this change?
+
+<!--
+  Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes the user interface.
+  How exactly did you verify that your PR solves the issue you wanted to solve?
+  If you leave this empty, your PR will very likely be closed.
+-->