add LightFX Sample Application on Lightsync integration page

Author: Aytackydln

content/integrations/lightfx.md

@@ -11,3 +11,7 @@ You can use Lightsync integration with [all supported devices]({{< relref "/devi
 You must install LightFX wrapper dll to the game directory from Aurora settings.
 
 > Note that this is reverse engineered and may not work as the original.
+
+In case game integration doesn't work,
+use [LightFX Sample Application](https://www.logitechg.com/sdk/LED_SDK_9.00.zip)
+to test if the integration is working properly.