client2 contains all the frontend code
contract contains all the Smart-contract code
The project is deplyoed at Live site
You can also check out the codesandbox link https://codesandbox.io/s/moz4mu.
All the necessary info, is in their respective readMe Files.
You wount be able to access the "Retailers" section because, inorder to get the access, one should add his address in the smart contract.
If the app does not behave as intended please check console messages or start the app from the login page.