Add initial implementation of game mechanics and resources management

Scripts/Follower.cs

@@ -0,0 +1,10 @@
+using Godot;
+
+namespace ParasiticGod.Scripts;
+
+[GlobalClass]
+public partial class Follower : Node2D
+{
+    public enum FollowerTier { Tier1, Tier2, Tier3, Tier4, Tier5 }
+    [Export] public FollowerTier Tier { get; private set; }
+}