add screenshot action

[koki-develop]

• implement action
• implement unit tests
• update readme

[codecov-commenter]

Codecov Report

Base: 76.74% // Head: 74.72% // Decreases project coverage by -2.01% ⚠️

Coverage data is based on head (0d6ac83) compared to base (cd7dc50).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   76.74%   74.72%   -2.02%     
==========================================
  Files           9       10       +1     
  Lines         258      277      +19     
==========================================
+ Hits          198      207       +9     
- Misses         50       60      +10     
  Partials       10       10              

Impacted Files	Coverage Δ
pkg/util/files.go	0.00% <0.00%> (ø)
pkg/config/action.go	79.59% <100.00%> (+2.06%)	⬆️

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