chore: feature pull request template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+> Please make sure all the requirements are satisfied, otherwise the PR could be closed without further notice.
+
+## Checklist
+
+- [ ] Title as described.
+- [ ] Your code should contain tests relevant for the problem you are solving.
+- [ ] Your code should be well documented if new functionality is added.
+- [ ] All new and existing tests passed.
+- [ ] Your commits messages format follows the [Conventional Commits Specification](https://www.conventionalcommits.org/).