Clarify the wet deposition is from EMEP model

[jialinl6]

Fixes #16

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 79.09%. Comparing base (86cf8e8) to head (6a375c2).
Report is 25 commits behind head on main.

Files	Patch %	Lines
src/wet_deposition.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   80.45%   79.09%   -1.37%     
==========================================
  Files           4        4              
  Lines         174      177       +3     
==========================================
  Hits          140      140              
- Misses         34       37       +3     

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