add esol descriptor

[hadim]

Checklist:

• [x] Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).
• [ ] Update the API documentation is a new function is added or an existing one is deleted.
• [x] Added a news entry.
  • copy news/TEMPLATE.rst to news/my-feature-or-branch.rst) and edit it.

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[codecov[bot]]

Codecov Report

Merging #86 (481c6dd) into main (c46f1e4) will increase coverage by 0.32%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   81.75%   82.08%   +0.32%     
==========================================
  Files          42       45       +3     
  Lines        3081     3137      +56     
==========================================
+ Hits         2519     2575      +56     
  Misses        562      562              

Flag	Coverage Δ
unittests	82.08% <100.00%> (+0.32%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datamol/__init__.py	100.00% <100.00%> (ø)
datamol/descriptors/__init__.py	100.00% <100.00%> (ø)
datamol/descriptors/descriptors.py	100.00% <100.00%> (ø)
datamol/predictors/__init__.py	100.00% <100.00%> (ø)
datamol/predictors/esol.py	100.00% <100.00%> (ø)

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[hadim]

Thanks for the review.