Enhancement: Add rule set for PHP 8.0

[localheinz]

This pull request

• adds a rule set for PHP 8.0

[codecov]

Codecov Report

Merging #350 (e443ea4) into main (40245b4) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #350   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         8         8           
===========================================
  Files              2         2           
  Lines             24        24           
===========================================
  Hits              24        24           

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