Add demo for multiple definitions

Author: julienduchesne

README.md

@@ -10,6 +10,8 @@ https://user-images.githubusercontent.com/29210090/145594957-efc01d97-d4c1-4fad-
 
 https://user-images.githubusercontent.com/29210090/145594976-670fff41-55e9-4ff9-b104-b5ac1cf77b42.mp4
 
+https://user-images.githubusercontent.com/29210090/154743159-81adf3b3-e929-4731-8b23-718085d222c5.mp4
+
 ### Error/Warning Diagnostics
 
 https://user-images.githubusercontent.com/29210090/145595007-59dd4276-e8c2-451e-a1d9-bfc7fd83923f.mp4