docs: add star history and contributor list to README.

[wangrongding]

• Increases project transparency: This can help other developers understand the popularity and activity level of the project.

• Recognizes contributors: Listing contributors can recognize those who have contributed to the project, which may also motivate more people to participate in the project.

• Provides more information: The star history chart and contributor list provide more information for potential users or contributors, helping them make decisions about whether to use or participate in the project.

[mifi]

Hi. I think contributors is not necessary in the readme because it's already showing on the right side:

I like the star history but I made it a bit smaller and moved it. thanks!