WIP: Adding a PureJaxRL example

[lebrice]

PureJaxRL example based on https://github.com/luchris429/purejaxrl/blob/main/examples/walkthrough.ipynb

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.12%. Comparing base (1c96794) to head (452037c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #237   +/-   ##
=======================================
  Coverage   72.12%   72.12%           
=======================================
  Files          58       58           
  Lines        5255     5255           
=======================================
  Hits         3790     3790           
  Misses       1465     1465           

Flag	Coverage Δ
unittests	72.12% <ø> (ø)

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