chore: Added Initial Engine Code

Engine.Core/GameManager.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+
+using Microsoft.Xna.Framework;
+
+using Syntriax.Engine.Core.Abstract;
+using Syntriax.Engine.Core.Factory;
+
+namespace Syntriax.Engine.Core;
+
+public class GameManager
+{
+    public Game Game { get; private set; } = null!;
+    private IList<IGameObject> _gameObjects = new List<IGameObject>(Constants.GAME_OBJECTS_SIZE_INITIAL);
+
+    private GameObjectFactory _gameObjectFactory = null!;
+    private GameObjectFactory GameObjectFactory
+    {
+        get
+        {
+            if (_gameObjectFactory is null)
+                _gameObjectFactory = new GameObjectFactory();
+            return _gameObjectFactory;
+        }
+    }
+
+    public IList<IGameObject> GameObjects => _gameObjects;
+
+    public void RegisterGameObject(IGameObject gameObject)
+    {
+        if (_gameObjects.Contains(gameObject))
+            throw new Exception($"{nameof(IGameComponent)} named {gameObject.Name} is already registered to the {nameof(GameManager)}.");
+
+        _gameObjects.Add(gameObject);
+    }
+
+    public T InstantiateGameObject<T>() where T : class, IGameObject
+    {
+        T gameObject = GameObjectFactory.Instantiate<T>();
+        _gameObjects.Add(gameObject);
+        return gameObject;
+    }
+
+    // public TGameObject RegisterGameObject<TGameObject, TTransform, TBehaviourController, TStateEnable>()
+    //     where TGameObject : class, IGameObject
+    //     where TTransform : class, ITransform
+    //     where TBehaviourController : class, IBehaviourController
+    //     where TStateEnable : class, IStateEnable
+    // {
+    //     TGameObject gameObject = Factory.GameObjectFactory.Get<TGameObject>();
+    //     _gameObjects.Add(gameObject);
+    //     return gameObject;
+    // }
+
+    public void RemoveGameObject(IGameObject gameObject)
+    {
+        if (!_gameObjects.Contains(gameObject))
+            throw new Exception($"{nameof(IGameComponent)} named {gameObject.Name} is not registered to the {nameof(GameManager)}.");
+
+        _gameObjects.Remove(gameObject);
+    }
+}