Add examples to jiter-python README

[simonw]

I used Claude 3.5 Sonnet to create the first draft of these, then edited them to improve them.

[hyperlint-ai]

1 files reviewed, 1 total issue(s) found.

[codspeed-hq]

CodSpeed Performance Report

Merging #143 will not alter performance

_{Comparing simonw:patch-1 (0387228) with main (ae5fc7d)}

Summary

✅ 73 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #143   +/-   ##
=======================================
  Coverage        ?   90.94%           
=======================================
  Files           ?       12           
  Lines           ?     2042           
  Branches        ?     2042           
=======================================
  Hits            ?     1857           
  Misses          ?      112           
  Partials        ?       73           

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[samuelcolvin]

Looks good to me, we should also document allow_inf_nan and float_mode, but that could just as well come in a later PR.

[samuelcolvin]

thanks so much @simonw, much appreciated.