Document dynamic length fields feature in README

[Paradoxis]

Add documentation for dynamic length fields in README.

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[Paradoxis]

@DissectBot agree

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (d967590) to head (cd9b11b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #148   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         21      21           
  Lines       2435    2435           
=====================================
  Misses      2435    2435           

Flag	Coverage Δ
unittests	0.00% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 12 untouched benchmarks

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_{Comparing Paradoxis:main (cd9b11b) with main (d967590)}