Add AWS Amplify build configuration file

[yosefmaru]

User story

As a DevOps engineer, I want to add an AWS Amplify yml config file, so that I can deploy the metadata entry web app on AWS.

Acceptance criteria

• [x] Add amplify.yml config file

Sprint Ready Checklist

1. • [x] Acceptance criteria defined
2. • [x] Team understands acceptance criteria
3. • [x] Team has defined solution / steps to satisfy acceptance criteria
4. • [x] Acceptance criteria is verifiable / testable
5. • [x] External / 3rd Party dependencies identified
6. • [x] Ticket is prioritized and sized