This is a pretty standard react native app made with Create React Native App. You can see their guide here. This app uses expo. It talks to the rainworks-backend running at rainworks-backend.herokuapp.com.
Install yarn, (I suppose you could use npm if you really wanted to).
Install the expo client, exp:
yarn global add expo-cli
Install app dependencies:
yarn
Start a local dev version:
yarn start
Publish a new version on expo:
expo publish
Create new binaries to send to app stores:
TODO