01_Application_Framework: Migrate new service and new application creation

01_Application_Framework: Migrate new service and new application creation

This moves out 03_Creating_a_New_Service and
04_Creating_a_New_Application under Application Framework folder, as
they don't really make sense being outside of it, when in fact they are
referring quite a lot to the Application Framework, being dependent
on the D-Bus IPC.

Bug-AGL: SPEC-4700
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I08819725efa89afe0b44ff7e3146906c43ff40d0
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/28522
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>