Update README.md

Author: asmfstatoil

README.md

@@ -70,7 +70,7 @@ conda install -c conda-forge neqsim
 ### Try it now
 
 ```python
-from neqsim.thermo import fluid
+from neqsim.thermo import fluid, TPflash, printFrame
 
 # Create a natural gas fluid
 fl = fluid('srk')
@@ -81,9 +81,12 @@ fl.setTemperature(25.0, 'C')
 fl.setPressure(60.0, 'bara')
 fl.setMixingRule('classic')
 
-from neqsim.thermo import TPflash, printFrame
 TPflash(fl)
 printFrame(fl)
+
+print(f"Gas density:    {fl.getPhase('gas').getDensity('kg/m3'):.2f} kg/m3")
+print(f"Gas viscosity:  {fl.getPhase('gas').getViscosity('kg/msec'):.6f} kg/(m*s)")
+print(f"Z-factor:       {fl.getPhase('gas').getZ():.4f}")
 ```
 
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