Add code style and testing documentation

[coditva]

No description provided.

[codecov]

Codecov Report

Merging #2 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #2   +/-   ##
=======================================
  Coverage   88.73%   88.73%           
=======================================
  Files           8        8           
  Lines          71       71           
=======================================
  Hits           63       63           
  Misses          8        8

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