Add README_KR.md

[HyeongminLEE]

Translated the readme file into Korean.

[github-actions]

Locust summary

Git references

Initial: 13f5904
Terminal: d76d2db

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[codecov]

Codecov Report

Merging #621 (d76d2db) into master (13f5904) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #621   +/-   ##
=======================================
  Coverage   89.32%   89.32%           
=======================================
  Files          54       54           
  Lines        3925     3925           
=======================================
  Hits         3506     3506           
  Misses        419      419           

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[haiyangdeperci]

Great! Thanks for contributing 👍