add generative-ai-java on springboot

[xlorne]

https://github.com/xlorne/springboot-starter-gemini

[rlazo]

Hey @xlorne it's not clear what's the issue you're reporting. Could you elaborate?

[xlorne]

Well, I found that Generative-AI does not have an SDK for Java, so I open sourced an open source SDK based on Java Springboot.