Add a demo, examples, etc to README

[Xevion]

Suggestion: Add a demo, example, or any other form that lets us visually see your repository/technology in action to your README.

I think people would love and appreciate your work more if a small demo was available - ideally a simple, quick video showing your technology.

If it can quickly summarize the details of it's options (even just 1-2), that'd be even better.

I just wanted to show my point of view about why I didn't "star" or look into this tech more - not that I am building anything with Puppeteer in the first place. I don't reckon that stars, popularity or attention was your reason for building it in the first place, but perhaps you'd wanna know.

If this suggestion stands in the way for what this repository is intended for, do close it. People are still working on it here and there, so I think the project is still fairly active, and therefore my suggestion may still be easy enough and provide ample return.