STEPS :

Add the client ID, client Secret and redirect urls in .env files and slackconfig.js Also replace the local server uri with your server uri wherever necessary.

Frontend :

cd frontend
npm install
npm start

Backend :

cd NICE_UCAAS
npm install
npm start

DynamoDB (local) :

cd dynamodb (local)
java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -sharedDb