Adding rho,p API

[andrsd]

No description provided.

[codecov]

Codecov Report

Patch coverage: 99.43% and project coverage change: +0.25% 🎉

Comparison is base (3d94a2f) 96.99% compared to head (0567e61) 97.24%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   96.99%   97.24%   +0.25%     
==========================================
  Files          23       23              
  Lines        1531     1707     +176     
==========================================
+ Hits         1485     1660     +175     
- Misses         46       47       +1     

Files Changed	Coverage Δ
include/Helmholtz.h	99.50% <ø> (ø)
include/SinglePhaseFluidProperties.h	100.00% <ø> (ø)
src/IdealGas.cpp	94.11% <95.00%> (+0.17%)	⬆️
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	94.07% <100.00%> (+0.18%)	⬆️
test/src/IdealGas_test.cpp	100.00% <100.00%> (ø)
... and 1 more

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