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.

Apri il README e individua la sezione Troubleshooting. Aggiungi una nota concisa che spieghi l'avviso relativo al package quando i file Java vengono usati al di fuori di una struttura di progetto, incluso il ruolo di una cartella src, quindi verifica che le nuove indicazioni corrispondano ai passaggi di riproduzione segnalati.