Backend assignment for contact identification for bitespeed

Steps to start:

1. start postgres docker container with the command: docker run -d --name postgres-db -e POSTGRES_USER=myuser -e POSTGRES_PASSWORD=mypassword -e POSTGRES_DB=mydatabase -p 5432:5432 postgres:13
2. Set PORT in env
3. run yarn start
4. Endpoint to test http://localhost:PORT/identify Succesfully identified primary and secondary contacts: