Enhance documentation and add metrics and similarity features

[danielogen]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Documentation
• Code Metrics
• Similarities

[codecov]

Codecov Report

❌ Patch coverage is 91.68646% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.96%. Comparing base (750d64a) to head (170b0f4).

Files with missing lines	Patch %	Lines
src/PyReprism/__init__.py	46.66%	16 Missing ⚠️
src/PyReprism/cli.py	86.04%	12 Missing ⚠️
src/PyReprism/ngrams.py	94.94%	5 Missing ⚠️
src/PyReprism/fingerprints.py	97.80%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
- Coverage   96.36%   95.96%   -0.41%     
==========================================
  Files         162      164       +2     
  Lines        5314     5720     +406     
==========================================
+ Hits         5121     5489     +368     
- Misses        193      231      +38     

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