Setup a workspace with project specific layer(s)

To setup a new workspace or update it run the following commands

• Scotty (head revision)
• Scotty (different revision)

    ## On your computer run
    $ scotty update --extra-download="<git clone url of the layer>"
    ## e.g.
    $ scotty update --extra-download="https://github.com/my-org/meta-my-project-layer"

    $ scotty update --extra-download="<git clone url of the layer>;my_revision"
    ## e.g.
    $ scotty update --extra-download="https://github.com/my-org/meta-my-project-layer;my-branch"