Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+Include changes, new features and etc:
+
+## Describe your tests
+How did you test your change?
+
+Python version:
+
+OS:
+
+## Checklist:
+- [ ] I added/edited example on new feature/change (if exists)
+- [ ] My changes won't break backend compatibility
+