feat: create creature interface

Client/Domain/Events/CreatureCreatedEvent.cs

@@ -0,0 +1,19 @@
+using Client.Domain.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Client.Domain.Events
+{
+    public class CreatureCreatedEvent : EventInterface
+    {
+        public readonly CreatureInterface Creature;
+
+        public CreatureCreatedEvent(CreatureInterface creature)
+        {
+            Creature = creature;
+        }
+    }
+}