Add ChargeProgressBar, Credits, and GameOverScreen components for UI management

scripts/UI/Credits.cs

@@ -0,0 +1,23 @@
+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.UI;
+
+public partial class Credits : Control
+{
+    private UIManager _uiManager;
+
+    public override void _Ready()
+    {
+        _uiManager = GetNode<UIManager>("/root/UIManager");
+    }
+
+    public override void _UnhandledInput(InputEvent @event)
+    {
+        if (!@event.IsActionPressed("ui_cancel")) return;
+        if (_uiManager != null && _uiManager.IsScreenOnTop(this))
+        {
+            _uiManager.PopScreen();
+        }
+    }
+}