when I add my folder in visual studio workspace, it create me new file(index.code-workspace)and when I delete it then my folder

>Solution :

Creating a workspace in Visual Studio Code Editor creates a JSON file named *.code-workspace. This JSON file is used to automatically restore all workspace settings in case you create a multi-root workspace.

Resources

• What is a ‘workspace’ in Visual Studio Code?
• What is a VS Code "workspace"?