Starting with CI4

I wanted to start a new application and try with CI4 But I even am not able to display a simple echo

I have this message

If you see this message, you have not configured your web server properly.
You need to set your "document root" to the 

Code:

public

 folder inside your project. This could be your default setting, or that of a virtual host, depending on how you set up your local development environment.

What shall I do. I am developping in local with url like localhost/cI4/index.php/test

I created a test.php controler with just echo test.