Add README.ko-KR.md(translation) in 'data-structures/linked-list'

[wckim]

• add README.ko-KR.md(translation) in 'data-structures/linked-list'

[codecov]

Codecov Report

Merging #433 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #433   +/-   ##
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  Coverage     100%   100%           
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  Files         149    149           
  Lines        2612   2612           
  Branches      434    434           
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  Hits         2612   2612

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[trekhleb]

Korean translation for the linked list has been added as a part of #466. Closing this PR for now, but feel free to update the existing translation if needed.