Add codecov file to the project

[vmadalin]

Description

Add codecov file to the project

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[codecov[bot]]

Codecov Report

Merging #5 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage     62.92%   62.92%           
  Complexity      186      186           
=========================================
  Files            62       62           
  Lines           615      615           
  Branches         70       70           
=========================================
  Hits            387      387           
  Misses          206      206           
  Partials         22       22

Flag	Coverage Δ	Complexity Δ
#unittest	62.92% <ø> (ø)	186 <ø> (ø)	:arrow_down:

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