Added SNEP protocol

The Simple NDEF Exchange Protocol is a high-level protocol for
transfering NDEF records between two NFC peers, with 'put' and
'get' primitives similar to HTTP. The current support for SNEP
includes 'put' and some response codes that are necessary for
sending NDEF records.
implemeneted SNEP SAP
added NDEF
added SNEP put sending
Added SNEP console command