Implement keyboard controls for the current version of calculator.

[shahinashamshodova]

Please review

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (97f7908) compared to base (a085992).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #6   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            3         3           
=========================================
  Hits             3         3           

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