Add Korean translation (README_KR.md)

[chlgusrbs0]

Hi,

I noticed that several languages are supported, but Korean is missing.

Would it be okay if I add a Korean translation of the README as README_KR.md?

[wachawo]

@hyungun0 Hello, yep shure. Thanks.

[chlgusrbs0]

Thanks. I’ll work on it soon.