Add coding style and test coverage to README.md

[MaxDesiatov]

No description provided.

[codecov]

Codecov Report

Merging #44 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #44   +/-   ##
======================================
  Coverage    55.4%   55.4%           
======================================
  Files          29      29           
  Lines        1397    1397           
======================================
  Hits          774     774           
  Misses        623     623

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