[WIP] Add Spring Boot Gradle PostgreSQL port under booklibrary-spring directory#29

Copilot wants to merge 3 commits intomainjborza/booklibrary:mainfrom

copilot/fix-9675c940-bbf3-4340-b7c0-fb8e744fb14cjborza/booklibrary:copilot/fix-9675c940-bbf3-4340-b7c0-fb8e744fb14cCopy head branch name to clipboard