Add attribute system with core stats and gameplay components

GameCore/ECS/Interfaces/IComponent.cs

@@ -0,0 +1,12 @@
+namespace GameCore.ECS.Interfaces;
+
+/// <summary>
+/// A marker interface for all components.
+/// Components are simple data containers (structs or classes) that hold the state
+/// for a specific aspect of an Entity (e.g., its position, health, or inventory).
+/// They contain no logic.
+/// </summary>
+public interface IComponent
+{
+    
+}