chore: add codecov badge

[dbi1463]

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[codecov]

Codecov Report

Merging #16 (682a73c) into develop (c44f8d5) will not change coverage.
The diff coverage is n/a.

❗ Current head 682a73c differs from pull request most recent head 63638de. Consider uploading reports for the commit 63638de to get more accurate results

@@           Coverage Diff            @@
##           develop      #16   +/-   ##
========================================
  Coverage    45.71%   45.71%           
========================================
  Files            3        3           
  Lines           35       35           
========================================
  Hits            16       16           
  Misses          19       19           

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