docs(patch): Summarised the provided helpers, with example code.

[wadetregaskis]

This helps folks understand what this package does and if it suits their needs, when browsing GitHub, the Swift Package Index, etc.

It also improves its visibility to search engines.

Tangentially, I also noticed that TimeIntervalCounter has typos in its incremenet methods (should be increment).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7a61996) 80.52% compared to head (918cbda) 80.52%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   80.52%   80.52%           
=======================================
  Files          16       16           
  Lines         539      539           
=======================================
  Hits          434      434           
  Misses        105      105           

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[axelandersson]

Looks good to me Thanks!

[dukhnyak]

Thank so very much for contribution @wadetregaskis !