- Add EDDIE structure section
- add build prerequisites section
- add reference to doxygen docs

Signed-off-by: Jacopo Zorzetto <jacopo.zorzetto@mail.polimi.it>
Signed-off-by: Francesco Pham <francesco.pham@huawei.com>

Co-authored-by: Jacopo Zorzetto <jacopo.zorzetto@mail.polimi.it>