Adding a few notes for first lab

README.md

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+Laboratorio di Architetture Software e Sicurezza Informatica [AAF1569]
+=============
+
+This repository hosts class material for the 2022-2023 edition of the course.
+
+Instructors: [Leonardo Querzoni](https://sites.google.com/diag.uniroma1.it/querzoni/) and [Daniele Cono D'Elia](https://www.diag.uniroma1.it/~delia/) (Sapienza University of Rome)
+
+Teaching assistants: Giacomo Priamo and Nicola Bottura
+
+### Contents
+*Listed as: class date, enclosing folder, topic*
+- 28/02/2023 `ruby-intro/` Ruby essentials

ruby-intro/book-lab/README.md

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 Ruby Intro
 =============
 
+This material is taken from the [GitHub repository](https://github.com/saasbook/hw-ruby-intro) for the Ruby introductory homework of the *Engineering Software as a Service* book we use for this class.
+
+Organized in three parts, it gives some basic practice in Ruby as well as getting you accustomed to making testing a regular part of your workflow. Make sure `rspec` is available in your environment (otherwise: `gem install rspec`).
+
 Learning Goals
 --------------
 

ruby-intro/examples/README.md

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+Ruby Examples
+=============
+
+This directory contains exemplary Ruby toy programs to get acquainted with basic features of the language.
+
+Outline of the `class_example_X.rb` files:
+1. Example of class usage (as in the slides for the lecture)
+2. Verbose vs. concise declaration of getter/setter/initialization methods
+3. Subclasses and getter/setter methods
+4. Subclasses and polymorphism
+5. Side-effects from a method
+6. Variable-length argument list
+
+The material was prepared by Prof. Giovanni Farina for last year's edition of this course. Thanks, Giovanni!