Improvement on coverage testing and contribution guidelines moved to docs

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (dev@ce691e5). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head a3b7950 differs from pull request most recent head e300b4d. Consider uploading reports for the commit e300b4d to get more accurate results

@@          Coverage Diff           @@
##             dev      #35   +/-   ##
======================================
  Coverage       ?   82.10%           
======================================
  Files          ?        7           
  Lines          ?       95           
  Branches       ?        0           
======================================
  Hits           ?       78           
  Misses         ?       17           
  Partials       ?        0           

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