Feat: first implementation of postgres db for backend

MyINPulse-back/src/main/resources/application.properties

@@ -2,3 +2,10 @@ spring.application.name=myinpulse
 spring.security.oauth2.resourceserver.jwt.jwk-set-uri=http://localhost:7080/realms/test/protocol/openid-connect/certs
 spring.security.oauth2.resourceserver.jwt.issuer-uri=http://localhost:7080/realms/test
 logging.level.org.springframework.security=DEBUG
+spring.datasource.url=jdbc:postgresql://localhost:5432/${MyINPulse_DB}
+spring.datasource.username=${POSTGRES_USER}
+spring.datasource.password=${POSTGRES_PASSWORD}
+spring.jpa.hibernate.ddl-auto=update
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
+
+spring.data.rest.base-path=/my/base/path