Study Foreman documentation

This issue consists of going through foreman documentation, tutorials and manuals.

Afterwards, it could be possible to address another steps in this process.

Docs:
https://www.theforeman.org/manuals/1.15/index.html
https://beryju.org/en/blog/getting-started-foreman-part-1#install_os
http://projects.theforeman.org/issues/432
https://groups.google.com/forum/#!topic/foreman-users/FP9uTb8TAFY