Add tooltip component and integrate it into the scene; adjust audio volume for coin sound effect

scripts/steam_integration.gd

@@ -0,0 +1,13 @@
+class_name SteamIntegration
+extends Node
+
+var app_id: String = "3575090"
+
+
+func _init() -> void:
+	OS.set_environment("STEAM_APP_ID", app_id)
+	OS.set_environment("STEAM_GAME_ID", app_id)
+
+
+func _ready() -> void:
+	pass