Added alias for add_subdirectory and FetchContent

src/CMakeLists.txt

@@ -7,6 +7,8 @@ add_library(glfw ${GLFW_LIBRARY_TYPE}
                  egl_context.c osmesa_context.c null_platform.h null_joystick.h
                  null_init.c null_monitor.c null_window.c null_joystick.c)
 
+add_library(glfw3::glfw3 ALIAS glfw)
+
 # The time, thread and module code is shared between all backends on a given OS,
 # including the null backend, which still needs those bits to be functional
 if (APPLE)