Add GPM and minified NEXRAD example files

[kmuehlbauer]

for Hydometeor Partitioning Ratio Calculation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main       #7   +/-   ##
=======================================
  Coverage        ?   69.23%           
=======================================
  Files           ?        4           
  Lines           ?       39           
  Branches        ?        0           
=======================================
  Hits            ?       27           
  Misses          ?       12           
  Partials        ?        0           

Flag	Coverage Δ
unittests	69.23% <ø> (?)

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