add CH224K

Manufacturer page: https://www.wch.cn/products/CH224.html (Chinese only)

Datasheet (no direct link, Chinese only): https://www.wch.cn/downloads/CH224DS1_PDF.html

Datasheet (English translation): https://www.laskakit.cz/user/related_files/ch224ds1.pdf

Screenshot:

I specified VBUS as well as CFG1, CFG2 and CFG3 as passive, because they are left unconnected in some applications (leading to warnings when specified as inputs as in datasheet).

VBUS is at the symbol's top, but in this case it is an analog input rather than asupply pin. Should it be above CC1 on the left?

USB pins are arranged such that they can be connected to USB connectors without crossing wires.

The corresponding FP is here: kicad-footprints!3324 (closed)

• Remove the instructional content of this template
• Provide a URL to a datasheet for the symbol(s) you are contributing
• An example screenshot image is very helpful
• Ensure that the associated footprints match the official footprint library
  • A new fitting footprint must be submitted if the library does not yet contain one.
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.