How Can theme developer add a Custom CSS functionality in wordpress theme option

I’ve done lots of search in Google But Still not able to add the functionality for user where they can add their custom css code.
I’ve already added lots functionality for user in the theme.
Actually I’m at earlier stage of theme development So Having not much experience in theme development.
I asked this que. on stack overflow So that Some one will en-surely help me in this.

Thanks in advance for all Viewers

Source: wordpress

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