Add tyny sword gym to docs

docs/gyms/tiny_swords/Buildings/Black Buildings/castle.gd

@@ -0,0 +1,18 @@
+extends Node2D
+
+@onready var _prestige_panel: PrestigePanel = $PrestigePanel
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass
+
+func _on_area_2d_mouse_entered() -> void:
+	_prestige_panel.visible = true
+
+func _on_area_2d_mouse_exited() -> void:
+	_prestige_panel.visible = false