Add attribute system with core stats and gameplay components

GameCore/Attributes/AttributeSystem.cs

@@ -0,0 +1,23 @@
+using GameCore.ECS;
+using GameCore.ECS.Interfaces;
+
+namespace GameCore.Attributes;
+
+public class AttributeSystem : ISystem
+{
+    public void Update(World world, float deltaTime)
+    {
+        var entities = world.GetEntitiesWith<AttributeComponent>();
+
+        foreach (var entity in entities)
+        {
+            var attributes = world.GetComponent<AttributeComponent>(entity);
+            if (attributes == null) continue;
+
+            var maxHealth = attributes.GetValue(Attribute.MaxHealth);
+            var currentHealth = attributes.GetValue(Attribute.Health);
+
+            if (currentHealth > maxHealth) attributes.SetCurrentValue(Attribute.Health, maxHealth);
+        }
+    }
+}