Aggiunto Capitolo sulle architetture software (#123)

Co-authored-by: Simone Gizzi <[email protected]>
Co-authored-by: Angelo Cassano <[email protected]>
Co-authored-by: Paolo Martinoli <[email protected]>
Co-authored-by: Tommaso Allevi <[email protected]>
Co-authored-by: Corrado Petrelli <[email protected]>