deleted not needed project templates

src/fltk/CMakeLists.txt

src/fltk/README.md

src/fltk/test_fltk.cpp

src/gtkmm/CMakeLists.txt

src/gtkmm/README.md

src/gtkmm/hello_world.cpp

src/gtkmm/hello_world.hpp

src/gtkmm/main.cpp

src/imgui/CMakeLists.txt

src/imgui/README.md

src/imgui/imgui.ini

src/imgui/test.cpp

src/main.cpp

src/nana/CMakeLists.txt

src/nana/main.cpp

src/qt/CMakeLists.txt

src/qt/HelloQt.cpp

src/qt/HelloQt.hpp

src/qt/qtMain.cpp

src/sdl/CMakeLists.txt