$ git clone https://github.com/0211AB/ode2code-aftersales.git

readme.md
backend/
   package.json
   .env (to create .env, check [prepare your secret session])
frontend/
   package.json
chat/
   package.json
...

$ cd frontend          // go to client folder
$ npm i    // npm install packages
$ npm start        // run it locally

// in the root level
$ cd backend
$ npm i       // npm install packages
$ npm start // run it locally

// in the root level
$ cd chat
$ npm i       // npm install packages
$ npm start // run it locally