Update README.md change from `cd ~/Downloads/commando-vm` to `cd ~/Downloads/commando-vm-main`

[PeterCullenBurbery]

In installation, change from cd ~/Downloads/commando-vm to cd ~/Downloads/commando-vm-main because when you download it, the folder is named commando-vm-main by default. You could name it commando-vm instead of commando-vm-main, but if you don't change the default it will be named commando-vm-main.

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[geo-lit]

@PeterCullenBurbery thank you for the catch. Please sign the google-cla so that we can merge your PR