add neopixel example

lib/sprocket-utils/utils_print.h

@@ -0,0 +1,15 @@
+#ifndef __SPROCKET_UTILS__
+#define __SPROCKET_UTILS__
+
+#include <Arduino.h>
+
+#ifndef SPROCKET_PRINT
+#define SPROCKET_PRINT 1
+#endif
+
+// TODO move to sprocket
+
+int FORMAT_BUFFER_SIZE(const char* format, ...);
+void PRINT_MSG(Print &out, const char* prefix, const char* format, ...);
+
+#endif