Add citations for damping parameters

[awvwgk]

Closes #90

[codecov]

Codecov Report

Attention: Patch coverage is 1.19760% with 330 lines in your changes missing coverage. Please review.

Project coverage is 46.02%. Comparing base (3a50cbd) to head (63a94e2).
Report is 23 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dftd3/param.f90	0.82%	9 Missing and 231 partials ⚠️
src/dftd3/citation.f90	0.00%	60 Missing ⚠️
app/driver.f90	8.69%	20 Missing and 1 partial ⚠️
app/cli.f90	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   48.63%   46.02%   -2.62%     
==========================================
  Files          34       25       -9     
  Lines        3707     2866     -841     
  Branches     1518     1294     -224     
==========================================
- Hits         1803     1319     -484     
+ Misses       1207      970     -237     
+ Partials      697      577     -120     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.