Document how to work with a non-"project" set of files

I'm very new to Java development and am learning by simply creating a few ad hoc files. I'm following a book that uses a folder/package structure of "ch01/sec01" which I mimicked in my VSC folder structure. I noticed that the plugin would always give an error for:

package ch01.sec01;

Saying that the package was actually "" instead. I ignored this error and just carried on but it bothered me. :) A friend pointed out that if I moved my files into a "src" folder, this would go away, and apparently this is the default if you make a new Java project, but as I was just playing around and not really doing a 'project', I never knew this was an issue.

My recommendation is that a quick note be adding to the Troubleshooting section of the readme.

Steps To Reproduce

1. Work with Java files w/o first making a Java project
2. Note that even though you have the right package, it gets flagged as an error.

Mở README và tìm phần Troubleshooting. Thêm một ghi chú ngắn gọn giải thích cảnh báo package khi các tệp Java được sử dụng bên ngoài cấu trúc dự án, bao gồm vai trò của thư mục src, sau đó xác minh rằng hướng dẫn mới phù hợp với các bước tái hiện đã được báo cáo.