added exception handling

api/Domain/Person.cs

@@ -24,10 +24,9 @@ public sealed class Person
         realName = realName.Trim();
 
         // TODO: Error Handling
-        if (username.Length is < 3 or > 32) throw new Exception();
-        if (realName.Length == 0) throw new Exception();
-        if (birthday >= DateOnly.FromDateTime(DateTime.Today)) throw new Exception();
-        if (!IsAtLeast16(birthday)) throw new Exception();
+        if (username.Length is < 3 or > 32) throw new ArgumentException("Username must be 3-32 chars.");
+        if (realName.Length == 0) throw new ArgumentException("Name cannot be empty");
+        if (!IsAtLeast16(birthday) || birthday >= DateOnly.FromDateTime(DateTime.Today)) throw new ArgumentException("Person must be at least 16 years old.");
 
         return new Person(username, realName, birthday);
     }