message: add to LICENSE file
diff: @@ -2,6 +2,7 @@ Copyright for original source of project (prior to commit a852d14 of:
  https://github.com/trueos/lumina/tree/master/src-qt5/core/lumina-theme-engine
  held by Ilya Kotov <forkotov02@hotmail.ru> https://sourceforge.net/projects/qt5ct/
  under an MIT License.
  +Original AUTHORS : https://sourceforge.net/p/qt5ct/code/HEAD/tree/trunk/qt5ct/AUTHORS
  All further commits are Copyright of q5sys under MIT License.
  