Update README.md

Author: jdaarevalo

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 ## Creating and filling a Postgres DB with Docker Compose
 
 This project create tables and fill the tables in a Postgres data base. The tables and data that create are in sql/ folder
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+Read the explanation here [Creating and filling a Postgres DB with Docker compose](https://levelup.gitconnected.com/creating-and-filling-a-postgres-db-with-docker-compose-e1607f6f882f)
 ## ER Diagram
 The ER Diagram of DB is this: