Add npm run build step for client react app in the README

[vishalol]

For client/build folder to exist, we need to run npm run build in the client react app folder. Otherwise, after running npm start locally, we get the error that client/build/index.html does not exist. Updated the readme to add the additional step.

[vishalol]

@crcastle please review :)

[crcastle]

Hi @vishalCR7, I don't get that error. Did you do the following?

cd client
npm install
cd ..
npm install
npm start

When you run npm start from the root folder, that runs npm run client, which runs node start-client.js, which runs npm start from the client directory, which runs react-scripts start.

react-scripts start doesn't require a build folder to be created for local development. For a production deploy, the heroku-postbuild step runs npm run build. Did you try to deploy it to production somewhere else?

[vishalol]

I encountered it while I was running it on GitHub codespaces (similar to running it locally). This is the screenshot of the error.