[Course Certification Task] Add raspi4b Support and a web app to control.

[xingleigao]

There is twice commmit.

1. Update go-rpio to support raspi4b
2. add a web app to control led light.

And I update ReadMe adn some images to that.

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[xingleigao]

/assign

[RyanZhaoXB]

please remove the binary of kubeedge-counter-controller

[RyanZhaoXB]

please move all the deployment yaml files of web controller and light mapper to a unified folder

[xingleigao]

Hi, I have fixed all issue. Please check again.

[xingleigao]

@RyanZhaoXB please have a look.

[xingleigao]

All has chenged. I agree with "remove all the vendor and use gomod", and I do that. Please have a look agin, thank you!@RyanZhaoXB