Add note on window not showing up on Wayland

See Overv/VulkanTutorial#384

Author: SaschaWillems

en/02_Development_environment.adoc

@@ -400,6 +400,9 @@ Running `make test` should show the program running successfully, and displaying
 The application should exit with the success return code (`0`) when you close the empty window.
 You should now have a complete makefile that resembles the following:
 
+[NOTE]
+If you're on Wayland and the window does not show up: Don't worry. The Wayland compositor might only display a window when the application actually presents something. The window will start to show up on Wayland once we reach the first chapter where we actually present to the window.
+
 [,make]
 ----
 CFLAGS = -std=c++17 -O2