After installing dependencies and cloning the repository, run in the main folder yarn install. It will install all required packages. Then, with use of yarn start, the app will open on http://localhost:3000. We will not be able to do much though - we have to connect with the API.
To get the API on your machine, follow the steps specified in API's readme.md. Proxy server is already configured, so after running both API and UI on your local machine - you can explore the features of our application in full detail.