Add fortitude linter

[awvwgk]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 70.89947% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.56%. Comparing base (23c9014) to head (7b32dd9).

Files with missing lines	Patch %	Lines
src/dftd3/output.f90	67.67%	19 Missing and 13 partials ⚠️
src/dftd3/utils.f90	0.00%	6 Missing ⚠️
src/dftd3/gcp.f90	85.18%	0 Missing and 4 partials ⚠️
app/cli.f90	25.00%	3 Missing ⚠️
app/driver.f90	78.57%	1 Missing and 2 partials ⚠️
src/dftd3/gcp/param.f90	85.71%	2 Missing and 1 partial ⚠️
src/dftd3/param.f90	33.33%	0 Missing and 2 partials ⚠️
app/argument.f90	0.00%	1 Missing ⚠️
src/dftd3/damping/z.f90	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #211   +/-   ##
=======================================
  Coverage   64.56%   64.56%           
=======================================
  Files          36       36           
  Lines        5074     5074           
  Branches     1775     1775           
=======================================
  Hits         3276     3276           
  Misses        810      810           
  Partials      988      988           

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