Adds requirements section

Signed-off-by: Manoel Campos <[email protected]>

Author: manoelcampos

README.md

@@ -1,7 +1,6 @@
 # CloudSim Plus Examples [![Build Status](https://github.com/cloudsimplus/cloudsimplus-examples/actions/workflows/maven.yml/badge.svg)](https://github.com/cloudsimplus/cloudsimplus-examples/actions/workflows/maven.yml)  
 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/cloudsimplus/cloudsimplus-examples)
 
-
 This module contains several [CloudSim Plus](https://github.com/cloudsimplus/cloudsimplus) examples,
 including those inherited from CloudSim and new ones for exclusive features. 
 Those later ones are available into the [org.cloudsimplus.examples](src/main/java/org/cloudsimplus/examples) package.
@@ -14,7 +13,13 @@ The example places all the required code inside the `main()` method just for con
 However, that code is not reusable. If you try to build simulations that way, you'll end up with a messy and duplicated code.
 Therefore, after you understood how to build basic simulations, you may want to try checking the [BasicFirstExample.java](src/main/java/org/cloudsimplus/examples/BasicFirstExample.java). It's a structured and reusable code that gives a picture of the best ways to write your simulations.
 
-## 1. Downloading the project
+## 1. Project Requirements
+
+CloudSim Plus Examples is a Java 17 project that uses maven for build and dependency management. To build and run the project, you need JDK 17+ installed and an updated version of maven (such as 3.8.6+). Maven is already installed on your IDE. Unless it's out-of-date or you want to build the project from the command line, you need to install maven into your operating system. 
+
+All project dependencies are download automatically by maven (including CloudSim Plus jars).
+
+## 2. Downloading the Project Sources
 
 You can download this project using (i) the download button on top of this page (ii) your own IDE for it or (iii) the command line as described below.
 
@@ -27,14 +32,30 @@ download the project source by cloning the repository issuing the following comm
 git clone https://github.com/cloudsimplus/cloudsimplus-examples.git
 ```
 
-## 2 Running Examples
+# 3. Building the Examples
+
+CloudSim Plus Examples is a maven project, therefore to build it, you have two ways:
+
+## 3.1 Using some IDE
+
+Open the project on your favorite IDE and click the build button and that is it.
+
+## 3.1 Using a terminal
+
+First, make sure you have an updated Maven version installed (such as 3.8.6+), open a terminal at the project root directory and type:
+
+```bash
+mvn clean install
+mvn dependency:resolve -Dclassifier=javadoc
+```
+
+The second command is optional but very useful to download CloudSim Plus JavaDocs and help you understand the API inside your IDE. 
 
-> **Warning**
-> Before trying to use this project, make sure you have JDK 17 installed.
+## 4. Running Examples
 
 There are 2 ways to run the examples in this project, as presented below.
 
-### By Means of an IDE
+### 4.1 Using some IDE
 
 The easiest way to run the examples is relying on some IDE.
 Below are required steps:
@@ -48,7 +69,7 @@ Below are required steps:
   You can run any one of the classes in this package to get a specific example. 
 - If you want to build your own simulations, the easiest way is to create another class inside this project.
 
-### Using the bootstrap.sh script
+### 4.2 Using the bootstrap.sh script
 
 The project has a [bootstrap.sh](bootstrap.sh) script you can use to build and run CloudSim Plus examples. 
 This is a script for Unix-like systems such as Linux, FreeBSD and macOS.