Pull request template (#23)

Author: denis-fokin

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+# Description
+
+Substitute this text with a concise description of the proposed change. Emphasize, why particular solution was chosen.
+
+Fixes # (issue)
+
+## Type of Change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+
+# How Has This Been Tested?
+
+## Automated Testing
+
+Specify tests that help to verify the change automatically.  
+
+- [ ] Test A
+- [ ] Test B
+
+## Manual Scenario 
+
+Please, provide several scenarios that you went through to verify that the change worked as expected.  
+
+# Checklist:
+
+- [ ] The change followed the style guidelines of the UTBot project
+- [ ] Self-review of the code is passed
+- [ ] The change contains enough commentaries, particularly in hard-to-understand areas
+- [ ] New documentation is provided or existed one is altered
+- [ ] No new warnings
+- [ ] Tests that prove my change is effective
+- [ ] All tests pass locally with my changes