Fem: add air and water fluid material into data/Mod/Material

src/Mod/Material/FluidMaterial/Air.FCMat

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+[FCMat]
+Name = Air
+Description = Standard air properties at 20 Degrees Celsius and 1 atm
+MolarMass = 28.965
+
+Density = 1.20 kg/m^3
+DynamicViscosity = 1.80e-5 kg/m/s
+KinematicViscosity = 1.511e-5 m^2/s
+
+VolumetricThermalExpansionCoefficient = 3.43e-3 m/m/K
+PrandtlNumber = 0.7
+
+SpecificHeat = 1.005 J/kg/K
+ThermalConductivity = 0.0257 W/m/K
+

src/Mod/Material/FluidMaterial/None.FCMat

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+[FCdMat]
+Name = None
+Description = None
+
+Density = 0 kg/m^3
+DynamicViscosity = 0 kg/m/s
+KinematicViscosity = 0 m^2/s
+VolumetricExpansionCoefficient = 0 m/m/K
+
+SpecificHeat = 0 J/kg/K
+ThermalConductivity = 0 W/m/K
+ThermalExpansionCoefficient = 0 um/m/K

src/Mod/Material/FluidMaterial/Readme.txt

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+This is the FreeCAD simple fluid material library
+data is taken from matweb
+currently only water and air at the standard condition (20C and 1 atm) is prepared for testing
+
+
+CSIR team is working on CfdFluidMaterial in CFD workbench to support more complex fluid material
+

src/Mod/Material/FluidMaterial/Water.FCMat

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+[FCdMat]
+Name = Water
+Description = Standard distilled water properties at 20 Degrees Celsius and 1 atm
+MolarMass = 18
+
+Density = 998 kg/m^3
+DynamicViscosity = 1.003e-3 kg/m/s 
+KinematicViscosity = 1.005 m^2/s
+
+VolumetricExpansionCoefficient = 2.07e-4 m/m/K
+
+SpecificHeat = 4.182 J/kg/K
+ThermalConductivity = 0.591 W/m/K
+