Add the PN532 library #18

Job	Run time
build (examples/bq25896_test)	57s
build (examples/bq27xxx_test)	1m 12s
build (examples/cc1101_recv)	1m 18s
build (examples/cc1101_recv_irq)	1m 13s
build (examples/cc1101_send)	1m 11s
build (examples/cc1101_send_irq)	1m 11s
build (examples/display_test)	1m 9s
build (examples/encode_test)	1m 12s
build (examples/factory_test)	2m 8s
build (examples/infrared_recv_test)	1m 16s
build (examples/infrared_send_test)	1m 16s
build (examples/lvgl_test)	1m 12s
build (examples/pn532_test)	58s
build (examples/record_test)	1m 1s
build (examples/tf_card_test)	1m 3s
build (examples/voice_test)	1m 6s
build (examples/ws2812_test)	1m 6s
	20m 29s

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