Add sample.c

sample.c

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+// This program simply loads a QOI file into Allegro
+// as a texture and then dumps the texture data as a PNG.
+// Take notice of lines 12 and 13. You only need to initialize
+// the QOI plugin (this registers the function hooks that Allegro
+// will use whenever you want to I/O on a filename ending in .qoi)
+// 
+// Compile the test program with:
+// gcc -o test allegro_qoi.c test.c -lallegro -lallegro_image -I./
+// 
+// qoi.h should be inside of your include path.
+// Either place it here, or in your system's global includes.
+
+#include <allegro5/allegro.h>
+#include <allegro5/allegro_image.h>
+#include "allegro_qoi.h"
+
+int main() {
+	al_init();
+	al_init_image_addon();
+	al_init_qoi();
+	ALLEGRO_BITMAP* bmp = al_load_bitmap("sample.qoi");
+	al_save_bitmap("out.png", bmp);
+	return 0;
+}