Add CRAN logs badges to README

[mayer79]

Added CRAN logs badges for package usage statistics.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.27%. Comparing base (8310378) to head (6027bb1).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   96.27%   96.27%           
=======================================
  Files          14       14           
  Lines        1074     1074           
=======================================
  Hits         1034     1034           
  Misses         40       40           

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