add simple usage of button

example/example.gui.gui_script

@@ -1,29 +1,21 @@
 local druid = require "druid.druid"
 
 function init(self)
-end
+	self.druid = druid.new(self)
 
-function final(self)
+	self.button = self.druid:new_button("button", function()
-	-- Add finalization code here
+		print("New click")
-	-- Remove this function if not needed
+	end)
 end
 
 function update(self, dt)
-	-- Add update code here
+	self.druid:update(dt)
-	-- Remove this function if not needed
 end
 
 function on_message(self, message_id, message, sender)
-	-- Add message-handling code here
+	self.druid:on_message(message_id, message, sender)
-	-- Remove this function if not needed
 end
 
 function on_input(self, action_id, action)
-	-- Add input-handling code here
+	self.druid:on_input(action_id, action)
-	-- Remove this function if not needed
-end
-
-function on_reload(self)
-	-- Add input-handling code here
-	-- Remove this function if not needed
 end