Update README.md

Procedure:

- On your host machine, open a command line session (PUTTY, DOS window...)

- From the ETSI ITS protocols project, clone the Vagrant folder

- In the file Vagrantfilemodify the tag config.vm.provision replacing <username> & <password> strings by your ETSI credentials

- In the file Vagrantfilem, odify the tag config.vm.provision replacing <username> & <password> strings by your ETSI credentials

- In the Vagrant folder, execute the following commands:

```sh

#!/bin/bash

# Prepare environment for the build

set -e # Exit with non 0 if any command fails

#set -e # Exit with non 0 if any command fails

#set -vx

# Update system

sudo DEBIAN_FRONTEND=noninteractive apt-get dist-upgrade -y

sudo DEBIAN_FRONTEND=noninteractive add-apt-repository ppa:linuxuprising/java -y

sudo DEBIAN_FRONTEND=noninteractive apt-get update

sudo DEBIAN_FRONTEND=noninteractive apt-get install emacs gcc-8 g++-8 git subversion lsof ntp gdb make cmake flex bison autoconf doxygen graphviz libtool libncurses5-dev expect libssl-dev libxml2-dev xutils-dev tcpdump libpcap-dev libwireshark-dev wget tree unzip sshpass kubuntu-desktop valgrind qt5-default qtmultimedia5-dev libqt5svg5-dev -y

sudo DEBIAN_FRONTEND=noninteractive apt-get install oracle-java10-installer oracle-java10-set-default -y

sudo DEBIAN_FRONTEND=noninteractive apt --fix-broken install -y

sudo DEBIAN_FRONTEND=noninteractive apt-get install emacs openjdk-11-jre gcc-8 g++-8 git subversion lsof ntp gdb make cmake flex bison autoconf doxygen graphviz libtool libncurses5-dev expect libssl-dev libxml2-dev xutils-dev tcpdump libpcap-dev libwireshark-dev wget tree unzip sshpass kubuntu-desktop valgrind qt5-default qtmultimedia5-dev libqt5svg5-dev -y

#sudo DEBIAN_FRONTEND=noninteractive apt-get install oracle-java10-installer oracle-java10-set-default -y

#sudo DEBIAN_FRONTEND=noninteractive apt --fix-broken install -y

sudo DEBIAN_FRONTEND=noninteractive apt-get autoremove --purge -y

sudo DEBIAN_FRONTEND=noninteractive apt-get clean

echo "etsi:etsi" | chpasswd 

sudo adduser etsi sudo

sudo su - etsi

USER=

if [ "${USER}" != "etsi" ]

then

    exit -1

export USERNAME=$1

export PASSWORD=$2

export HOME=/home/etsi

export PATH_DEV=${HOME}/dev

export HOME_FRAMEWORKS=${HOME}/frameworks

export HOME_LIB=${HOME}/lib

chmod 775 *.bash devenv.bash.ubuntu

cd /home/etsi

ln -sf /home/etsi/dev/STF525_Its/scripts/devenv.bash.ubuntu /home/etsi/devenv.bash

export HOME=/home/etsi

. /home/etsi/devenv.bash

# Install all frameworks