Add a 1 second long fade out from white to black in input folder

Just as there is a file called example.png that we all use to start the project, I humbly propose adding this asset to the "input" folder. Is a 1 second long fade out from white to black in mp4 format.

Thank you very much for your great job! 😃

https://github.com/comfyanonymous/ComfyUI/assets/10329472/d3bad403-e85a-4d6f-bdd7-7e9ac7ab73d1