How do I make a read replica of this database?

Guys, I need help with the terraform
can I create a PostgreSQL database with this command:

resource “aws_db_instance” “banco” {

allocated_ storage = 10

engine = “postgres”

engine_version = “12.5”

instance_class = “db.t2.micro”

name = “bank1”

username = “admini”

backup_retention_period = 1

multi_az = true

password = “loki0506”

skip_final_snapshot = true

db_subnet_group_name = aws_db_subnet_group.db_subnet.id

how do I make a read replica of this database?
I am very grateful if you can help me.