Expand English documentation for chapter 1

Signed-off-by: Lucas Di Landro  <lu.ka11@hotmail.com>
Signed-off-by: Ignacio Berrio   <Naigna-_97@hotmail.com>
Signed-off-by: Felipe Rodríguez <feliipe.rs@hotmail.com>

Acked-by: Daniel Francis <francis@sugarlabs.org>