update README.md

README.md

-# Ventoy
+# Ventoy (https://www.ventoy.net)
 Ventoy is an open source tool to create bootable USB drive for ISO files.   
 With ventoy, you don't need to format the disk over and over, you just need to copy the iso file to the USB drive and boot it.   
 You can copy many iso files at a time and ventoy will give you a boot menu to select them.