Added URI for Free Electrons in intro

Signed-off-by: Conrad Gomes <conrad.s.j.gomes@gmail.com>
Changed intro and added section on about Free Electrons

Signed-off-by: Conrad Gomes <conrad.s.j.gomes@gmail.com>
Added section on About BeagleBoard.org foundation

Signed-off-by: Conrad Gomes <conrad.s.j.gomes@gmail.com>