I can't find .env file Laravel on Windows 10

I'm using Laravel for the first time. I have to run this command: "php composer key:generate" but i get this:

 [ErrorException]

file_get_contents(C:\xampp\htdocs\laravel/.env): failed to open stream: No such file or directory

I have no ".env" file or ".example.env". What's wrong? Thanks.

via ValeMarz