Update Contact.cs

Domain/Contact.cs

@@ -9,7 +9,11 @@ namespace Domain
             ContactValue = contactValue;
             Person = person;
             ContactType = contactType;
-            
+            //when creating a new contact then we add the contact to person and
+            //contactType aswell. so we can get to contact from person and from
+            //contactType. Otherwise Contact has a person and a contactType
+            //for the person but if coming from contactType or person side
+            //then theres nothing.
             person.Contacts.Add(this);
             contactType.Contacts.Add(this);
         }