Add initial resource and presenter classes for game entities and effects

Code/Resources/SimulationConfigResource.cs

@@ -0,0 +1,9 @@
+using Godot;
+
+namespace CryptonymThunder.Code.Resources;
+
+[GlobalClass]
+public partial class SimulationConfigResource : Resource
+{
+    [Export] public float GravityStrength { get; set; } = 9.81f;
+}