Added code coverage reporting

[wrmilling]

What was a problem?

Missing specific reporting on code coverage for the repo.

How this PR fixes the problem?

Adds a basic CodeCov report for the repo. Also added a few basic badges for the readme.

Check lists

• Test passed
• [ZX] Coding style (indentation, etc)

Additional Comments (if any)

N/A

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@211d245). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #3   +/-   ##
=========================================
  Coverage          ?   97.56%           
=========================================
  Files             ?        5           
  Lines             ?       82           
  Branches          ?        0           
=========================================
  Hits              ?       80           
  Misses            ?        2           
  Partials          ?        0

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