feat: add skills

Client/Domain/Service/EntityHandler.cs

@@ -45,8 +45,7 @@ namespace Client.Domain.Service
 
         public T? GetEntity(uint id)
         {
-            T? result = null;
-
+            T? result;
             entities.TryGetValue(id, out result);
 
             return result;

Client/Domain/Service/SkillHandler.cs

@@ -0,0 +1,30 @@
+using Client.Domain.Entities;
+using Client.Domain.Events;
+using Client.Domain.Factories;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Client.Domain.Service
+{
+    public class SkillHandler : EntityHandler<Skill>
+    {
+        public override void OnCreate(Skill entity)
+        {
+            eventBus.Publish(new SkillCreatedEvent(entity));
+        }
+        public override void OnDelete(Skill entity)
+        {
+            eventBus.Publish(new SkillDeletedEvent(entity.Id));
+        }
+
+        public SkillHandler(EntityFactoryInterface<Skill> factory, EventBusInterface eventBus) : base(factory)
+        {
+            this.eventBus = eventBus;
+        }
+
+        private readonly EventBusInterface eventBus;
+    }
+}