Investigate RMDB and NOSQL

[jgarbora]

RMDB database must be used for DVD, Customers and Lendings persistence. A NOSQL engine must be used for persisting system events.

[ricardogarfe]

Search for a database and configure it using Spring-boot management

Documentation

Spring boot database management documentation:

• https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-sql.html