Create pull_request_template.md

pull_request_template

Author: ihorkuf

.github/pull_request_template.md

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+## Describe your changes
+
+...
+
+## Issue ticket number and link
+
+...
+
+## Checklist before requesting a review
+
+- [ ] I have performed a self-review of my code
+- [ ] If it is a core feature, I have added thorough tests
+- [ ] Do we need to implement analytics?
+- [ ] Will this be part of a product update? If yes, please write one phrase about this update