Update README.md to mention that this is a stub package

[asinghvi17]

I wasn't sure whether I should depend on this package or not, so read the source code. For people who don't go that far this could help clarify.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1161c15) to head (9cfb332).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #24   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            4         6    +2     
=========================================
+ Hits             4         6    +2     

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

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