chore: Added Initial Engine Code

Engine.Core/Static/Internal/Constants.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+
+namespace Syntriax.Engine.Core;
+
+internal static class Constants
+{
+    internal static int BEHAVIOURS_SIZE_INITIAL = 16;
+    internal static int GAME_OBJECTS_SIZE_INITIAL = 256;
+}