add: Agent, ProxyMethod, LoadingScene

src/PoloniumRegistry.cs

@@ -1,4 +1,5 @@
 using Godot;
+using Polonium.Agents;
 using Polonium.Resources;
 using Polonium.Scenes;
 
@@ -16,4 +17,5 @@ public class PoloniumRegistry
     {
         DirAccess.MakeDirAbsolute("user://saves");
     }
+    public Dictionary<string, Agent> Agents { get; set; } = new();
 }