improvment of README, add in usage the parametter -l,--list to list all availables vm, check if the main location for the vm exists, in case it did not exists quit with exit code 0

README.md

@@ -1,3 +1,28 @@
 # vm-start
 
-script which permit me to launch all my vm thanks to qemu
+## Description:
+script which permit to launch easily some virtual machines via qemu
+
+## Dependencies:
+
+- <u>qemu</u> full installation
+
+## Usage:
+
+### to get some help;
+
+vm-start --help
+
+### to list all vm already configured
+
+vm-start --list
+
+### to create a new vm
+
+vm-strart <nom_de_la_vm> create create_disk=<location_of_iso_file>
+
+you can of course add options like uefi to tun in uefi mode, or nproc=<nb_proc> to select a number of processors.
+
+If you go to the conf folder created the first time you launch the script, you will find all configured variables for each of your vm.
+
+

vm-start.sh

@@ -14,6 +14,7 @@ NAME is the name of the virtual machine to use.
 PARAMETTER available
     -h, --help              Print this help and exit
     -v, --version           Print the version of this program and quit
+    -l, --list              Print the list of all availables machines and quit <TODO>
 
 COMMAND available
     init                    Create the conf file in conf/NAME_var.sh
@@ -37,7 +38,15 @@ OPTION available
                             -display gtk -vga qxl
     create_disk=<loc_disk>  Def a create disk to boot on. Is necessary for using create, or need the variable INSTALLATION_DISK_LOCATION to be set.
 "
+
 MAIN_LOCATION="$HOME/virtual_machine"
+# if MAIN_LOCATION doesn't exists, create the folder.
+if [ -f "$MAIN_LOCATION" ]
+then
+    mkdir "$MAIN_LOCATION" || exit 0 #Exit in case the folder can't be created.
+    echo "$MAIN_LOCATION created to contain all virtual machines."
+fi
+
 OPTION="-display gtk \
     -usbdevice tablet"