visitor pattern changes

Author: anupavanm

README.md

@@ -1933,7 +1933,7 @@ class Monkey : IAnimal
 
  public void Accept(IAnimalOperation operation)
  {
- throw new NotImplementedException();
+  operation.VisitMonkey(this);
  }
 }
 
@@ -1946,7 +1946,7 @@ class Lion : IAnimal
 
  public void Accept(IAnimalOperation operation)
  {
- throw new NotImplementedException();
+  operation.VisitLion(this);
  }
 }
 
@@ -1959,7 +1959,7 @@ class Dolphin : IAnimal
 
  public void Accept(IAnimalOperation operation)
  {
- throw new NotImplementedException();
+  operation.VisitDolphin(this);
  }
 }
 ```