Update README.md

Update README.md

Implement lambda to notify a passenger

Implement lambdas to sent notification for flight

Add implementation for notification service to start check-in process

Validate query parameter in get /flights route

Set GSI2 into handleModel on flight repository

Set Awaiting as default state when creating flights

Set Problem Details format in the API responses methods

Add isDate function

Fix imports to relative path

Set enumerators to string values

Add GSI2 into DynamoModel

Merge branch 'main' of github.com:felipeoriani/aws-serverless-nodejs-typescript-sample

Add lambda handlers for check-in