added yolo example

[hiddentn]

https://github.com/ml5js/ml5-library/pull/176

[bomanimc]

Hey @TheHidden1! We're archiving this repository and moving its contents into the core ml5-library repository (more context on issue #809 and pull request #831). We appreciate your contributions and would love it if you'd consider reopening this pull request on the ml5-library repo! Thanks!