[SPARK4] Update readme

[henrydavidge]

What changes are proposed in this pull request?

(Details)

How is this patch tested?

• Unit tests
• Integration tests
• Manual tests

(Details)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@c13f528). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #610   +/-   ##
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  Coverage        ?   92.36%           
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  Files           ?      126           
  Lines           ?     7357           
  Branches        ?      606           
=======================================
  Hits            ?     6795           
  Misses          ?      562           
  Partials        ?        0           

Flag	Coverage Δ
unittests	92.36% <ø> (?)

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