[docs] LFB README_zh-CN.md

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[codecov]

Codecov Report

Merging #761 (379927b) into master (24d1b7e) will not change coverage.
The diff coverage is n/a.

❗ Current head 379927b differs from pull request most recent head 0112b2c. Consider uploading reports for the commit 0112b2c to get more accurate results

@@           Coverage Diff           @@
##           master     #761   +/-   ##
=======================================
  Coverage   85.41%   85.41%           
=======================================
  Files         130      130           
  Lines        9401     9401           
  Branches     1580     1580           
=======================================
  Hits         8030     8030           
  Misses        967      967           
  Partials      404      404           

Flag	Coverage Δ
unittests	85.40% <ø> (ø)

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