Update README.md

Procedure for a Windows host machine:

- On your host machine, open a the Docker Quickstart Terminal

- On your host machine, clone the ETSI ITS protocols project. NOTE that only Docker folder and .jenkins.sh script file are required

- From the ETSI ITS protocols project root directory, execute the following commands:

Procedure for a Linux host machine:

- On your host machine, open a terminal and change to a working folder such as $HOME/temp

On your host machine, clone the following items from ETSI ITS protocols project:

- The docket folder

- The .jenkins.sh script file (hidden file)

From the your current directory, execute the following commands:

```sh

$ ./.jenkins.sh