added arduino nfcReader files (#42)

Arduino/nfcReader/PN532/mac_link.cpp

@@ -0,0 +1,20 @@
+
+#include "mac_link.h"
+#include "PN532_debug.h"
+
+int8_t MACLink::activateAsTarget(uint16_t timeout)
+{
+	pn532.begin();
+	pn532.SAMConfig();
+    return pn532.tgInitAsTarget(timeout);
+}
+
+bool MACLink::write(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
+{
+    return pn532.tgSetData(header, hlen, body, blen);
+}
+
+int16_t MACLink::read(uint8_t *buf, uint8_t len)
+{
+    return pn532.tgGetData(buf, len);
+}