chore: Added Initial Engine Code

Engine.Core/StateEnable.cs

@@ -0,0 +1,39 @@
+using System;
+
+using Syntriax.Engine.Core.Abstract;
+
+namespace Syntriax.Engine.Core;
+
+public class StateEnable : IStateEnable
+{
+    public Action<IAssignableEntity>? OnEntityAssigned { get; set; } = null;
+    public Action<IStateEnable>? OnEnabledChanged { get; set; } = null;
+
+    private bool _enabled = true;
+    private IEntity _entity = null!;
+
+    public IEntity Entity => _entity;
+
+    public bool Enabled
+    {
+        get => _enabled;
+        set
+        {
+            if (value == _enabled)
+                return;
+
+            _enabled = value;
+            OnEnabledChanged?.Invoke(this);
+        }
+    }
+
+    public bool Assign(IEntity entity)
+    {
+        if (_entity is not null)
+            return false;
+
+        _entity = entity;
+        OnEntityAssigned?.Invoke(this);
+        return true;
+    }
+}