change installation method from deprecated flag to new subcommand

[yusufpapurcu]

I got this warning while installing, seems like --install flag is deprecated and replacement is the dotnet new install subcomand.

also using 8.0.101 version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (075fbe2) 97.51% compared to head (94ca77f) 97.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   97.51%   97.51%           
=======================================
  Files          49       49           
  Lines         442      442           
  Branches       21       21           
=======================================
  Hits          431      431           
  Misses         10       10           
  Partials        1        1           

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