Update cmd.md

If you want to map a drive from another network to your filesystem you can do that like this:

```

# This will map it to drive z

net use z: \\192.168.1.101\SYSVOL

# This will map it to the first available drive-letter

net use * \\192.168.1.101\SYSVOL

```

Here you map the drive to the letter **z**. If the command is successfull you should now be able to access those files by entering the **z** drive.