add Lua script that shows a target on screen for the zapper x,y

output/Lua/NES/ZapperTarget.lua

@@ -0,0 +1,20 @@
+-- Draws a target on screen representing the x,y coordinates of the Zapper plugged into the 2nd port
+
+while true do
+	buttons = joypad.get();
+	x = buttons["P2 Zapper X"];
+	y = buttons["P2 Zapper Y"];
+	fired = buttons["P2 Fire"];
+
+	color = "white";
+	if fired then
+		color = "red";
+	end
+
+	gui.drawLine(x - 4, y + 4, x + 4, y - 4, color);
+	gui.drawLine(x + 4, y + 4, x - 4, y - 4, color);
+	gui.drawEllipse(x - 5, y - 5, 10, 10, color);
+	gui.drawPixel(x, y, "red");
+	gui.drawEllipse(x - 1, y - 1, 2, 2, "red");
+	emu.frameadvance()
+end