Add Finder::nth() method to find the 1st, 2nd, 3rd, and so on matching item, or multiple matching items at specific positions

[samsonasik]

• Add nth method
• Add unit test for nth method
• Update readme

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (300522a) to head (8dc1cfc).
⚠️ Report is 2 commits behind head on main.
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Additional details and impacted files

@@             Coverage Diff             @@
##                main       #43   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        87        96    +9     
===========================================
  Files              8         8           
  Lines            253       281   +28     
===========================================
+ Hits             253       281   +28     

Flag	Coverage Δ
tests	100.00% <100.00%> (ø)

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