Added a section about the rxinput trick

Setup-Guide.md

@@ -2,6 +2,7 @@ In this guide:
 * [Prerequisites](https://github.com/moonlight-stream/moonlight-android/wiki/Setup-Guide#prerequisites)
 * [Quick Setup Instructions](https://github.com/moonlight-stream/moonlight-android/wiki/Setup-Guide#quick-setup-instructions)
 * [Streaming over the Internet](https://github.com/moonlight-stream/moonlight-android/wiki/Setup-Guide#streaming-over-the-internet)
+* [Using a gamepad connected to the PC instead of the streaming device](https://github.com/moonlight-stream/moonlight-android/wiki/Setup-Guide#using-a-gamepad-connected-to-the-pc-instead-of-the-streaming-device)
 
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@@ -42,6 +43,9 @@ NVIDIA has disabled UPnP support in GFE 2.4.1, so it is necessary to forward por
 * TCP 35043, 47984, 47989, 47995, 47996, 48010
 * UDP 47998, 47999, 48000
 
+##Using a gamepad connected to the PC instead of the streaming device
+Normally, Moonlight sends controller input from the streaming client which gets sent to the game by GFE. If you want to connect a controller to your PC instead of the streaming device, GFE can cause some problems because the emulated controller still appears to games as controller 1. Luckily there is a workaround for this. You'll need to rename the DLL that Nvidia is using to send controller input so it won't be used anymore. On 32-bit and 64-bit Windows, rename rxinput.dll to rxinput.dll.old on in C:\Program Files\NVIDIA Corporation\NvStreamSrv. On 64-bit versions, there's another copy of the DLL in C:\Program Files (x86)\NVIDIA Corporation\NvStreamSrv which you'll want to rename. You may have to do the renaming again if GFE does an update, but it should allow you to use your controller normally on games that only support 1 controller.
+
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