added some explanations

README.md

@@ -4,6 +4,26 @@ This repository contains Terraform recipes to deploy various modern virtual mach
 
 By modern, it is meant virtual machines that leverage the use of modern desktop-oriented technologies, like UEFI firmware and recent virtual motherboard chipset (i.e. Phyllome OS itself), by staying as close as possible as domain definitions maintained [here](https://git.phyllo.me/roots/xml-definition-for-domains).
 
+## Organization
+
+The folder *multiple* contains two subfolders, one with shared modules and the other with the various target deployment environments.
+
+The idea is to reuse modules across multiple virtual machines and operating systems.
+
+```
+./multiple:
+environments  shared_modules
+
+./multiple/environments:
+cloud_init.yaml  ubuntu-cloud-server-2404-bios
+
+./multiple/environments/ubuntu-cloud-server-2404-bios:
+ubuntu-cloud-server-2404-bios.tf
+
+./multiple/shared_modules:
+cloud-init.tf  domain.tf  network.tf  outputs.tf  pool.tf  provider.tf  variables.tf  volume.tf
+```
+
 ## Requirements
 
 - [QEMU](https://www.qemu.org/) 
@@ -17,7 +37,7 @@ Your Linux x86_64-based machine has at least 4 GB of available memory and 2 CPUs
 ## How to use it
 
 - Clone this repository
-- Go to folder *ubuntu-cloud-server-2404-bios*
+- Go to folder *example*
 - Execute the following commands, which will download and install the required Terraform provider if not already present
 
 ```
@@ -221,6 +241,8 @@ libvirt_pool.ubuntu2: Destruction complete after 0s
 Destroy complete! Resources: 4 destroyed.
 ```
 
+
+
 ## Explanations
 
 Let's take a look inside the *ubuntu-cloud-server-2404-bios* folder, which contains two files, *ubuntu-cloud-server-2404-bios.tf* and *cloud_init.cfg*