add new chemistry example

[natestemen]

Description

add new example.

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License

• I license this contribution under the terms of the GNU GPL, version 3 and grant Unitary Fund the right to provide additional permissions as described in section 7 of the GNU GPL, version 3.

Before opening the PR, please ensure you have completed the following where appropriate.

• I added unit tests for new code.
• I used type hints in function signatures.
• I used Google-style docstrings for functions.
• I updated the documentation where relevant.
• Added myself / the copyright holder to the AUTHORS file

[natestemen]

could you changee this to something else

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.70%. Comparing base (6c73a09) to head (88b43d9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2470   +/-   ##
=======================================
  Coverage   98.70%   98.70%           
=======================================
  Files          88       88           
  Lines        4091     4091           
=======================================
  Hits         4038     4038           
  Misses         53       53           

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[natestemen]

opened as part of a demonstration at qnumerics 2024. closing.