Add initial resource and presenter classes for game entities and effects

Code/Resources/Effects/DamageEffectResource.cs

@@ -0,0 +1,9 @@
+using Godot;
+
+namespace CryptonymThunder.Code.Resources.Effects;
+
+[GlobalClass]
+public partial class DamageEffectResource : EffectResource
+{
+    [Export] public float Amount { get; set; } = 10f;
+}