Adding rho,T API

[andrsd]

No description provided.

[codecov]

Codecov Report

Patch coverage: 98.12% and project coverage change: +0.13% 🎉

Comparison is base (bf9a64c) 96.81% compared to head (1842a47) 96.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   96.81%   96.95%   +0.13%     
==========================================
  Files          23       23              
  Lines        1352     1511     +159     
==========================================
+ Hits         1309     1465     +156     
- Misses         43       46       +3     

Files Changed	Coverage Δ
include/Helmholtz.h	99.50% <ø> (ø)
include/SinglePhaseFluidProperties.h	100.00% <ø> (ø)
src/IdealGas.cpp	93.93% <86.36%> (-2.17%)	⬇️
python/src/fprops.cpp	100.00% <100.00%> (ø)
src/Helmholtz.cpp	100.00% <100.00%> (ø)
test/src/Air_test.cpp	100.00% <100.00%> (ø)
test/src/CarbonDioxide_test.cpp	100.00% <100.00%> (ø)
test/src/Helium_test.cpp	100.00% <100.00%> (ø)
test/src/Helmholtz_test.cpp	93.89% <100.00%> (+0.24%)	⬆️
test/src/IdealGas_test.cpp	100.00% <100.00%> (ø)
... and 1 more

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