Uses PN532 to get the UID of an nfc card and (try to) compare it with a default value

Dependencies:   LibPN532 mbed

Revision:
0:9d2afe43dcf1
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Oct 20 13:39:41 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/e95d10626187
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