Added haddock documentation

src/Model/Enum.hs

@@ -1,11 +1,13 @@
 module Model.Enum where
 
+-- |The representation of a Rosetta enum data type
 data EnumType = MakeEnum {
     enumName :: String,
     enumDescription :: Maybe String,
     enumValues :: [EnumValue]
 } deriving (Show, Eq)
 
+-- |The representation of a Rosetta enum value type
 data EnumValue = MakeEnumValue {
     enumValueName :: String,
     enumValueDescription :: Maybe String,