feat: create new calculator app

[thomasrockhu-codecov]

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@be3d9f2). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head da24e2b differs from pull request most recent head 96c235b. Consider uploading reports for the commit 96c235b to get more accurate results

@@          Coverage Diff           @@
##             main     #16   +/-   ##
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  Coverage        ?   0.00%           
  Complexity      ?       2           
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  Files           ?       1           
  Lines           ?       4           
  Branches        ?       0           
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  Hits            ?       0           
  Misses          ?       4           
  Partials        ?       0           

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