Add some doc in the readme to explain how this repo works

[ysmood]

Help beginners to understand it to reduce misuse.

[FournyP]

Hello everyone, will this issues ever be treated ?

I'm currently using chromedp project and I have some problems with detection.

I have see your comment here : chromedp/chromedp#669 (comment) and I want to understand how to use this project.

I have also see test file but I don't understand how to implement that with chromedp.

Have a good day and thank you for your work.

[ysmood]

@FournyP I think the demo code I showed there is enough, you can ask the maintainers of chromedp for help. Sorry, I'm not interested in translating code to chromedp.