Added very basic SDL2 demo app

project/jni/application/sdl2-demo/README.md

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+# SDL2 Demo
+
+This is a simple example that illustrates how to use SDL2 with a basic event
+loop, transparent PNG textures, TTF fonts, ... It is designed to be compatible
+with Android plaforms!
+
+## Dependencies
+
+```
+$ sudo apt-get install libsdl2-dev libsdl2-image-dev  libsdl2-ttf-dev
+```
+
+## Compilation
+
+With CMake:
+
+```
+$ mkdir build ; cd build ; cmake .. ; make VERBOSE=ON
+```
+
+Or without, if you prefer:
+
+```
+$ gcc -std=c99 -O3 -Wall -c -o main.o main.c
+$ gcc -std=c99 -O3 -Wall -c -o demo.o demo.c
+$ gcc -rdynamic -lm -lSDL2 -lSDL2_ttf -lSDL2_image demo.o main.o -o demo
+```
+
+## Run Demo
+
+```
+$ ./demo
+```
+
+Move the bomb with keyboard arrows and move Mario with mouse. Press ESC to quit.
+Enjoy this SDL2 sample!
+
+## Model
+
+An empty `model.c` is also available to easily start your own project!
+
+```
+$ gcc -std=c99 -O3 -Wall -c -o main.o main.c
+$ gcc -std=c99 -O3 -Wall -c -o model.o model.c
+$ gcc -rdynamic -lm -lSDL2 -lSDL2_ttf -lSDL2_image  model.o main.o -o model
+```
+
+--
+aurelien.esnard@u-bordeaux.fr