contracourse

### Prerequisites - [X] I have read the [Contributing Guidelines](https://github.com/sk5s/countdateapp#contributing). - [X] I agree to follow the [Code of Conduct](https://github.com/sk5s/countdateapp/blob/main/CODE_OF_CONDUCT.md). - [X] I have searched for [existing issues](https://github.com/sk5s/countdateapp/issues) that already...