Create Graph Node: Fatty Acids

[Sulstice]

  Node to be added to the Knowledge Graph
  ```python
        class Fatty Acids(object):
            def __init__(self):
                self.name == 'fatty acids'
            @staticmethod
            def get_smiles():
              smiles =  {'arachidic': '', ' behenic': '', ' eicosadienoic': '', ' eicosenoic': '', ' linoleic': '', ' linolenic': '', ' myristic': '', ' oleic': '', ' palmitic': '', ' palmitoleic': '', ' sativic': '', ' stearic': '', ' lignoceric and cis- vaccenic': ''}
              return smiles
  ```