added arduino nfcReader files (#42)

Arduino/nfcReader/PN532/examples/p2p_raw/p2p_raw.ino

@@ -0,0 +1,50 @@
+// snep_test.ino
+// send a SNEP message to adnroid and get a message from android
+
+#include "SPI.h"
+#include "PN532_SPI.h"
+#include "llcp.h"
+#include "snep.h"
+
+PN532_SPI pn532spi(SPI, 10);
+SNEP nfc(pn532spi);
+
+void setup()
+{
+    Serial.begin(115200);
+    Serial.println("-------Peer to Peer--------");
+}
+
+uint8_t message[] = {
+0xD2, 0xA, 0xB, 0x74,0x65, 0x78, 0x74, 0x2F, 0x70, 0x6C, 
+0x61, 0x69, 0x6E, 0x68, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x77, 
+0x6F, 0x72, 0x6C, 0x64};
+
+uint8_t buf[128];
+
+void loop()
+{
+
+    nfc.write(message, sizeof(message));
+    delay(3000);
+
+    int16_t len = nfc.read(buf, sizeof(buf));
+    if (len > 0) {
+      Serial.println("get a SNEP message:");
+      for (uint8_t i = 0; i < len; i++) {
+        Serial.print(buf[i], HEX);
+        Serial.print(' ');
+      }
+      Serial.print('\n');
+      for (uint8_t i = 0; i < len; i++) {
+        char c = buf[i];
+        if (c <= 0x1f || c > 0x7f) {
+          Serial.print('.');
+        } else {
+          Serial.print(c);
+        }
+      }
+      Serial.print('\n');
+    }
+    delay(3000);
+}