Added example, added makefile

makefile

@@ -0,0 +1,20 @@
+#Infos: http://www.ijon.de/comp/tutorials/makefile.html
+
+
+VERSION = 1.0
+CC      = /usr/bin/gcc
+CFLAGS  = -Wall -g -D_REENTRANT -DVERSION=\"$(VERSION)\" 
+#LDFLAGS = -lm -lpthread `gtk-config --cflags` `gtk-config --libs` -lgthread
+LDFLAGS = -lwiringPi -lm
+
+OBJ = gy521example.o libgy521.o
+
+waterpicore: $(OBJ)
+	$(CC) $(CFLAGS) -o gy521example $(OBJ) $(LDFLAGS)
+        
+%.o: %.c
+	$(CC) $(CFLAGS) -c $<
+
+.PHONY: clean
+clean:
+	rm -r *.o