Update readme.md

    By default the container uses bridge networking, and uses the same IP as the docker host. 

    If you want to give it a seperate IP address, create a macvlan network that matches your local subnet, for example:

    If you want to give it a seperate IP address, create a macvlan network. For example:

    ```

    $ docker network create -d macvlan \

        --ip-range=192.168.0.100/28 \

        -o parent=eth0 vdsm

    ```

    Modify these values to match your network configuration. And change the network of the container to `vdsm` in your run command or compose file:

    Modify these values to match your local subnet. And change the docker network of the container from `bridged` to `vdsm` in your run command or compose file:

    ```

     --network vdsm --ip=192.168.0.100

    ```

    This also has the advantage that you don't need to do any portmapping anymore, because all ports will be fully exposed.

    This also has the advantage that you don't need to do any portmapping anymore, because all ports will be fully exposed this way.

  * ### How do I install a specific version of vDSM? ###