## Description

<!--- A brief description of this PR and the problem is trying to solve -->

## Linked issue

<!--- Put here the relevant issue from YouTrack -->

## Type of change
<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
- [ ] 🐞 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 change)
- [ ] ⛑ git-flow chore (backport, hotfix, etc)

## Developer checklist
<!--- A mental checklist for the developer submitting the PR --->
- [ ] I have read the [style guide](https://github.com/input-output-hk/cardano-sl/blob/develop/docs/style-guide.md) document, and my code follows the code style of this project.
- [ ] If my code deals with exceptions, it follows the [guidelines](https://github.com/input-output-hk/cardano-sl/blob/develop/docs/exceptions.md).
- [ ] I have updated any documentation accordingly, if needed.

## Testing checklist
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.

## QA Steps
<!--- Which are the steps needed to test this feature, if any? -->

## Screenshots (if available)
<!--- Upload a GIF, an asciinema video or an image demoing the feature -->

Add initial pull request template
Add initial pull request template
