That's an app which fetch external data using Redux and render HTML without using WebViewers.
You'll need to configure your environment to use React Native to run the apps. Check out the documentation for each OS and then jump to the next step. Select the "Building Projects with Native Code" tab option to follow the instructions.
After cloning the project and configuring the environment, run the command npm install to install the dependencies and then just run react-native run-android to run in the Android Simulator/Device (Make sure you have a device connected or a simulator already running) or react-native run-ios to run the iOS Simulator (Needs an iOS system to do this).