Add a github pull request template

[EvgeneOskin]

Description of the change

This change adds a missed github pull request for reviewers.

Type of change

• [ ] Feature
• [x] Codebase Improvements
• [ ] Critical security bugs
• [ ] Hotfix

Reviewer's checklist

• [ ] The code does not have any obvious logic errors.
• [ ] All cases specified in the requirements are fully implemented.
• [ ] There is sufficient automated testing for the new code. Existing automated tests were rewritten to account for code changes.
• [ ] The new code conforms to existing style guidelines.