Added Vega EOS modell(helmholtz free energy) for helium

[victorigi99]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.53846% with 120 lines in your changes missing coverage. Please review.

Project coverage is 41.80%. Comparing base (d7cf0b1) to head (2c9519f).

Files with missing lines	Patch %	Lines
.../main/java/neqsim/thermo/util/Vega/NeqSimVega.java	0.00%	65 Missing ⚠️
src/main/java/neqsim/thermo/util/Vega/Vega.java	79.01%	40 Missing and 11 partials ⚠️
src/main/java/neqsim/thermo/phase/Phase.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1278      +/-   ##
============================================
+ Coverage     41.71%   41.80%   +0.08%     
- Complexity     6170     6189      +19     
============================================
  Files           729      731       +2     
  Lines         69423    69735     +312     
  Branches       8327     8359      +32     
============================================
+ Hits          28962    29154     +192     
- Misses        38689    38798     +109     
- Partials       1772     1783      +11     

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[asmfstatoil]

please run
mvn javadoc:fix and commit the changes before merge