Fix Java compilation issue and add Docker support

[nilamadhabpurohit-aiops]

Fix Java compilation issue and add Docker support

Summary

This PR resolves a critical Java compilation issue and enhances the project by adding Docker and multi-stage container support. It improves the overall structure and makes the project easier to build and deploy.

Java Improvements

• Fixed incorrect Scanner variable usage (scanner.close() → input.close()).
• Resolved compilation failure in the application.
• Improved resource management and ensured proper cleanup.
• Verified the application works correctly after the fix.

Code Structure Improvements

• Added proper Java package structure following best practices.
• Updated folder structure to align with the package.
• Ensured correct classpath configuration.

DevOps Enhancements

• Added Dockerfile for easy containerized execution.
• Implemented multi-stage Docker build to reduce image size and improve security.
• Verified Docker build and runtime behavior.

Documentation Updates

• Updated README with Docker and multi-stage build instructions.

Why this change?

The project was failing to compile due to a variable mismatch and lacked container support. This update ensures the application works correctly and follows modern development and deployment practices.

Testing

• Successfully compiled and tested locally.
• Verified application execution.
• Built and tested Docker image.
• Verified multi-stage Docker build.

Please let me know if any further improvements are required. I would be happy to update the PR.