docs: add nuget badge and dotnet example

[PrzemyslawKlys]

Summary

• add NuGet version and download badges to README
• document NuGet installation and include a simple C# usage example

Testing

• dotnet test
• pwsh -NoLogo -NoProfile -Command "Invoke-Pester -Path Module/Tests" (fails: The term 'Get-IISParsedLog' is not recognized)

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https://chatgpt.com/codex/tasks/task_e_68ad54a98620832e912a2b3f2212f6c4

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.40%. Comparing base (5516a4c) to head (45918c2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #20   +/-   ##
=======================================
  Coverage   86.40%   86.40%           
=======================================
  Files           5        5           
  Lines         206      206           
  Branches       35       35           
=======================================
  Hits          178      178           
  Misses         20       20           
  Partials        8        8           

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