This commit sends a draft of the topics that will be included
as a section for Kbuild documentation.
It also includes content for the Kconfig Structure section.
The intention of this draft is to start gathering comments on
the content sent and the initial menu of topics.
Change-Id: I11f62b015ef0fc722f5e0a089ec83cb0a08b3889
Signed-off-by: Juan Manuel Cruz <juan.m.cruz.alcaraz@linux.intel.com>