Create a ColorPicker demo

[Zengyf-CVer]

Description

I created a demo that randomly generates dark or light colors based on the ColorPicker component. The following is a demonstration of this demo:
https://huggingface.co/spaces/Zengyf-CVer/Color_Switch

Checklist:

• I have performed a self-review of my own code
• My code follows the style guidelines of this project
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[abidlabs]

Hi @Zengyf-CVer, thanks for the contribution! Happy to add the demo to the gradio repo, but I'd like to make some suggestions:

• First, we have each demo in a separate folder in a file called run.py. It's important that each demo follows this pattern so that we can load them correctly on the website. Can you move the demo to a separate folder? I would suggest naming the folder something like color_generator and putting your code in a run.py file inside of the folder
• Second, please add this demo to the ColorPicker component's documentation here:

gradio/gradio/components.py

Line 2897 in 4ef87e0

Demos: color_picker

• As far as the demo itself, it looks good. I would suggest also including a Textbox output that shows the color that is generated as a hexadecimal string

[Zengyf-CVer]

@abidlabs Thanks for your suggestion, I will seriously revise it.