Add initial implementation of game mechanics and resources management

Scripts/FollowerMarker.cs

@@ -0,0 +1,27 @@
+using Godot;
+
+namespace ParasiticGod.Scripts;
+
+[GlobalClass]
+public partial class FollowerMarker : Marker2D
+{
+    public bool IsOccupied { get; private set; }
+    public Follower FollowerInstance { get; private set; }
+
+    public void PlaceFollower(Follower followerInstance)
+    {
+        if (IsOccupied) return;
+        AddChild(followerInstance);
+        followerInstance.Position = Vector2.Zero;
+        IsOccupied = true;
+        FollowerInstance = followerInstance;
+    }
+
+    public void RemoveFollower()
+    {
+        if (!IsOccupied) return;
+        FollowerInstance.QueueFree();
+        FollowerInstance = null;
+        IsOccupied = false;
+    }
+}