Add basic README.md to example_gamepad

example_gamepad/README.md

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+# Gamepad Example
+
+This example demonstrates how to use SDL2 with ofxPiMapper in order to use gamepad for mapping. Below is what you have to do.
+
+## Install SDL2
+
+```
+sudo apt-get update
+sudo apt-get -y install libsdl2-dev
+```
+
+In order to compile the example, one has to add extra compiler flags (see `config.make`). 
+
+```
+PROJECT_LDFLAGS += -I/usr/include/SDL2 -lSDL2
+```
+
+What it does is the following: `-I/usr/include/SDL2` includes SDL2, `-lSDL2` links our program against it.
+
+**Note:** This is tested on Raspberry Pi so far. 
+
+## Define Game Controller
+
+On each system a speciffic controller will have a different GUID. When `example_gamepad` is launched, it reads connected USB game controllers.
+
+```
+Joystick INIT success
+Joystick num axes: 2
+Joystick ID: 0
+Joystick Name: usb gamepad
+Joystick GUID: 030000001008000001e5000010010000
+```
+
+Use this to add another config block in `controllers.xml`
+
+