bug: document undocumented depends and requirements

[mckaygerhard]

after solved minimun requirements for liblxqt and qtxdg in #42 for qt5 in the past comits, now new depends are, each module need document specific depends..

• documented minimun build modules
• sumarize the build depends of the project in "taht moment" of time
• once sumarize depends create repo with each one due today those are ovbiously deprecared
  • create new repo for qtxdg qt5 for mlde specifically and rename it (permit coexists with newer)
  • create new repo for libqt qt5 for mlde specifically and rename it (permit coexists with newer)
  • create new repo for menu-cache lib and rename it (permit coexists with newer) only for mlde

due the behaviour of the project each depends will be a separate library :

-- No module descriptor found for panel, generating new one.
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.28") 
-- checking for module 'libmenu-cache>=0.3.3'
--   package 'libmenu-cache>=0.3.3' not found
CMake Error at /usr/share/cmake-3.0/Modules/FindPkgConfig.cmake:341 (message):
  A required package was not found
Call Stack (most recent call first):
  /usr/share/cmake-3.0/Modules/FindPkgConfig.cmake:395 (_pkg_check_modules_internal)
  src/panel-dash_xdg/CMakeLists.txt:55 (pkg_check_modules)
-- No module descriptor found for panel_dash_xdg, generating new one.